Prospective · frozen 2026-08-26 snapshot

Hegotá candidate complexity assessment

Original PFI result: 776 across 37 scored EIPs. The SFI/CFI extension adds 80 across 2 scored EIPs, producing a combined visibility view of 856 across 39 scored Execution Layer surfaces. 7 PFI entries remain not applicable or explicitly excluded.

Independent LLM Evaluation. These scores were produced with an LLM using the same Execution Layer complexity-assignment rubric, independently of the STEEL team’s ongoing manual assessment work. The Human column below records where that manual work stands for each candidate.

Common information cutoff: 2026-08-25T11:56:58Z. The assessment covers Execution Layer and execution-client networking surfaces only. It does not predict final fork scope or include observed outcomes.

Scored EL surfaces

7 not applicable

Low / Medium / High

4 / 21 / 14

Under-specified at snapshot

36 / 39

Human checklists

25 of 46

Complete 2
Available in open PR 15
Draft PR 8
Pending 21

22 same-rubric Human/LLM comparisons

Human checklist sources: ethspecs/pm at 2026-08-14 plus 24 open pull requests (captured 2026-09-13)

Statuses follow the real source state. Complete is merged on main; Available in open PR exists only in an open pull request; Draft PR is in a draft pull request; Incomplete has unresolved cells or inconsistent totals and carries no score; Pending has no checklist anywhere. A missing checklist is never a zero.

#73 Add complexity assessments · EIP-4758, EIP-7709, EIP-8188, EIP-8205 · updated 2026-05-29
#105 Add EIP-4758 complexity assessment · EIP-4758 · updated 2026-08-17
#106 Add EIP-8146 complexity assessment · EIP-8146 · updated 2026-08-17
#108 Add EIP-8279 complexity assessment (draft) · EIP-8279 · updated 2026-08-17
#109 Add EIP-8200 complexity assessment (draft) · EIP-8200 · updated 2026-08-18
#110 Add EIP-8372 complexity assessment (draft) · EIP-8372 · updated 2026-08-24
#111 Add EIP-8250 complexity assessment (draft) · EIP-8250 · updated 2026-08-18
#112 Add EIP-7666 complexity assessment (draft) · EIP-7666 · updated 2026-08-18
#113 Add EIP-7645 complexity assessment · EIP-7645 · updated 2026-08-18
#114 Add EIP-2488 complexity assessment · EIP-2488 · updated 2026-08-18
#115 Add EIP-3298 complexity assessment · EIP-3298 · updated 2026-08-18
#116 Update EIP-5920 complexity assessment to checklist revision 2 · EIP-5920 · updated 2026-08-18
#118 Update EIP-7668 complexity assessment to checklist revision 2 · EIP-7668 · updated 2026-08-18
#120 Add EIP-7709 complexity assessment · EIP-7709 · updated 2026-08-24
#122 Rename checklist "anchors" to "criteria" (draft) · EIP-5920, EIP-7668, EIP-7805, EIP-8141 · updated 2026-08-20
#124 Add EIP-7862 complexity assessment · EIP-7862 · updated 2026-08-24
#125 Add EIP-8188 complexity assessment · EIP-7862, EIP-8188 · updated 2026-08-24
#126 Add EIP-8115 complexity assessment (draft) · EIP-8115 · updated 2026-08-24
#127 Add EIP-8304 complexity assessment · EIP-8304 · updated 2026-08-24
#128 Add EIP-7819 complexity assessment (draft) · EIP-7819 · updated 2026-08-24
#129 Add EIP-8368 complexity assessment (draft) · EIP-8368 · updated 2026-08-24
#132 Add EIP-7906 complexity assessment · EIP-7906 · updated 2026-08-24
#133 Add EIP-8272 complexity assessment · EIP-8272 · updated 2026-08-25
#134 Add EIP-7923 complexity assessment · EIP-7923 · updated 2026-08-25

Where the Complexity Comes From

Each segment sums one criterion across the fork's scored LLM assessments. Hover or focus a segment for its points, share, and the number of contributing EIPs.

View Absolute complexity (bar length is the fork total) Composition (each fork normalized to 100%)

Hegotá856 points · 39 EIPs

Composition table: points per criterion and fork

Hegotá: criterion points across 39 scored candidates
Criterion	Hegotá
Added opcodes	18 · 2% · 8 EIPs
Modified opcodes	36 · 4% · 12 EIPs
Modified precompiles	7 · 1% · 3 EIPs
Added system contracts	16 · 2% · 9 EIPs
Modified system contracts	4 · 0% · 4 EIPs
EVM Gas rule changes	39 · 5% · 23 EIPs
State-access ordering within opcode execution	19 · 2% · 10 EIPs
Blob gas accounting changes	2 · 0% · 1 EIP
State gas accounting changes	7 · 1% · 4 EIPs
New EVM gas refund	4 · 0% · 2 EIPs
New transaction types	3 · 0% · 1 EIP
New or modified transaction validity mechanisms	21 · 2% · 9 EIPs
New block / header fields	6 · 1% · 2 EIPs
Encoding changes (RLP/SSZ)	33 · 4% · 11 EIPs
Block syncing changes	12 · 1% · 6 EIPs
New fork activation mechanism	30 · 4% · 10 EIPs
Engine API changes	9 · 1% · 4 EIPs
Transition-tool interface changes	15 · 2% · 7 EIPs
Patterns affecting pre-existing tests	69 · 8% · 37 EIPs
New invariant on pre-existing tests	22 · 3% · 14 EIPs
New test-framework primitives	16 · 2% · 11 EIPs
Security risks	93 · 11% · 38 EIPs
Performance risks	75 · 9% · 34 EIPs
Edge/boundary conditions	106 · 12% · 39 EIPs
Cryptography	13 · 2% · 8 EIPs
Cross-EIP interactions	105 · 12% · 36 EIPs
Unspecified behavior requiring cross-client consensus	76 · 9% · 34 EIPs
Total	856

Complexity Assessments

LLM rows were automated using the GPT-5.6 Sol LLM at xhigh reasoning effort, evaluating the EIP revision linked in the Assessment Input column against version 2 of STEEL’s complexity-assignment template. Human rows are STEEL reviewers’ published checklists; their status badge links to the pull request or merged report. Select rows from either evaluator to compare them, or open an EIP for its full assessment.

Totals and charts use the original 2026-08-26 candidate snapshot. The table retains every published evaluation, grouped by EIP with newer evaluations first. Evaluation dates link to the assessed spec revision; human checklist evaluation dates are not recorded.

Hegotá 2026-08-26 candidate snapshot: all published evaluations, with not-applicable entries and pending human checklists counted above

EIP-2488 Deprecate the CALLCODE opcode	PFI	2026-08-26	LLMChecklist v2	Complete	10	Low	Yes
EIP-2488 Deprecate the CALLCODE opcode	PFI	Not recorded	HumanChecklist v2	Open PR	13	Medium	—
EIP-3298 Remove storage-clear refund and refund cap	PFI	2026-08-26	LLMChecklist v2	Complete	12	Medium	No
EIP-3298 Remove storage-clear refund and refund cap	PFI	Not recorded	HumanChecklist v2	Open PR	6	Low	—
EIP-4758 Deactivate SELFDESTRUCT	PFI	2026-08-26	LLMChecklist v2	Complete	14	Medium	Yes
EIP-4758 Deactivate SELFDESTRUCT	PFI	Not recorded	HumanChecklist v2	Open PR	8	Low	—
EIP-5920 PAY opcode	PFI	2026-08-26	LLMChecklist v2	Complete	16	Medium	Yes
EIP-5920 PAY opcode	PFI	Not recorded	HumanChecklist v2	Open PR	14	Medium	—
EIP-7645 Alias ORIGIN to SENDER	PFI	2026-08-26	LLMChecklist v2	Complete	11	Low	Yes
EIP-7645 Alias ORIGIN to SENDER	PFI	Not recorded	HumanChecklist v2	Open PR	8	Low	—
EIP-7666 EVM-ify the identity precompile	PFI	2026-08-26	LLMChecklist v2	Complete	15	Medium	No
EIP-7666 EVM-ify the identity precompile	PFI	Not recorded	HumanChecklist v2	Draft PR	12	Medium	—
EIP-7668 Remove bloom filters	PFI	2026-08-26	LLMChecklist v2	Complete	10	Low	Yes
EIP-7668 Remove bloom filters	PFI	Not recorded	HumanChecklist v2	Open PR	7	Low	—
EIP-7709 Read BLOCKHASH from Storage and Update Cost	PFI	2026-08-26	LLMChecklist v2	Complete	20	Medium	Yes
EIP-7709 Read BLOCKHASH from Storage and Update Cost	PFI	Not recorded	HumanChecklist v2	Open PR	17	Medium	—
EIP-7805 Fork-choice enforced Inclusion Lists (FOCIL)	SFI	2026-09-11	LLMChecklist v2	Complete	20	Medium	Yes
EIP-7805 Fork-choice enforced Inclusion Lists (FOCIL)	SFI	Not recorded	HumanChecklist v1	Complete	15	Medium	—
EIP-7807 SSZ execution blocks	PFI	2026-08-26	LLMChecklist v2	Complete	34	High	Yes
EIP-7819 SETDELEGATE instruction	PFI	2026-08-26	LLMChecklist v2	Complete	21	Medium	Yes
EIP-7819 SETDELEGATE instruction	PFI	Not recorded	HumanChecklist v2	Draft PR	22	Medium	—
EIP-7851 Code-Controlled EOA Delegation	PFI	2026-08-26	LLMChecklist v2	Complete	23	High	Yes
EIP-7862 Delayed State Root	PFI	2026-08-26	LLMChecklist v2	Complete	14	Medium	No
EIP-7862 Delayed State Root	PFI	Not recorded	HumanChecklist v2	Open PR	19 published 26	Medium	—
EIP-7906 Transaction Assertions via State Diff Opcode	PFI	2026-08-26	LLMChecklist v2	Complete	28	High	Yes
EIP-7906 Transaction Assertions via State Diff Opcode	PFI	Not recorded	HumanChecklist v2	Open PR	23	High	—
EIP-7923 Linear, Page-Based Memory Costing	PFI	2026-08-26	LLMChecklist v2	Complete	23	High	Yes
EIP-7923 Linear, Page-Based Memory Costing	PFI	Not recorded	HumanChecklist v2	Open PR	15	Medium	—
EIP-7979 Call and Return Opcodes for the EVM	PFI	2026-08-26	LLMChecklist v2	Complete	16	Medium	Yes
EIP-8025 Optional Execution Proofs	PFI	2026-08-26	LLMChecklist v2	Complete	21	Medium	Yes
EIP-8077 eth/XX - announce transactions with nonce	PFI	2026-08-26	LLMChecklist v2	Complete	15	Medium	Yes
EIP-8094 eth/vhash - Blob-Aware Mempool	PFI	2026-08-26	LLMChecklist v2	Complete	20	Medium	Yes
EIP-8115 Batch priority fees at end of block	PFI	2026-08-26	LLMChecklist v2	Complete	16	Medium	Yes
EIP-8115 Batch priority fees at end of block	PFI	Not recorded	HumanChecklist v2	Draft PR	10	Low	—
EIP-8116 Replace cumulative receipt fields	PFI	2026-08-26	LLMChecklist v2	Complete	10	Low	Yes
EIP-8131 Unified Transaction Content Floor	PFI	2026-08-26	LLMChecklist v2	Complete	18	Medium	Yes
EIP-8141 Frame Transaction	CFI	2026-09-11	LLMChecklist v2	Complete	60	High	Yes
EIP-8141 Frame Transaction	CFI	Not recorded	HumanChecklist v1	Complete	38	High	—
EIP-8146 Block Access List Sidecars	PFI	2026-08-26	LLMChecklist v2	Complete	20	Medium	Yes
EIP-8146 Block Access List Sidecars	PFI	Not recorded	HumanChecklist v2	Open PR	19	Medium	—
EIP-8148 Custom sweep threshold for validators	PFI	2026-08-26	LLMChecklist v2	Complete	27	High	Yes
EIP-8151 Account Code Restricted ecRecover	PFI	2026-08-26	LLMChecklist v2	Complete	22	Medium	Yes
EIP-8182 Private ETH and ERC-20 Transfers	PFI	2026-08-26	LLMChecklist v2	Complete	20	Medium	Yes
EIP-8188 Last-Written Block for Accounts and Slots	PFI	2026-08-26	LLMChecklist v2	Complete	26	High	Yes
EIP-8188 Last-Written Block for Accounts and Slots	PFI	Not recorded	HumanChecklist v2	Open PR	18	Medium	—
EIP-8200 EVMification	PFI	2026-08-26	LLMChecklist v2	Complete	28	High	Yes
EIP-8200 EVMification	PFI	Not recorded	HumanChecklist v2	Draft PR	22	Medium	—
EIP-8205 Withdrawal credentials preregistration	PFI	2026-08-26	LLMChecklist v2	Complete	24	High	Yes
EIP-8205 Withdrawal credentials preregistration	PFI	Not recorded	HumanChecklist v1	Open PR	5	Low	—
EIP-8237 Independent CL/EL Sync	PFI	2026-08-26	LLMChecklist v2	Complete	29	High	Yes
EIP-8250 Keyed Nonces for Frame Transactions	PFI	2026-08-26	LLMChecklist v2	Complete	42	High	Yes
EIP-8250 Keyed Nonces for Frame Transactions	PFI	Not recorded	HumanChecklist v2	Draft PR	22 published 20	Medium	—
EIP-8253 Bump nonce of zero-nonce storage accounts	PFI	2026-08-26	LLMChecklist v2	Complete	20	Medium	Yes
EIP-8272 Recent Roots for Frame Transactions	PFI	2026-09-16 Re-evaluation	LLMChecklist v2	Complete	24	High	Yes
EIP-8272 Recent Roots for Frame Transactions	PFI	2026-08-26	LLMChecklist v2	Complete	39	High	Yes
EIP-8272 Recent Roots for Frame Transactions	PFI	Not recorded	HumanChecklist v2	Open PR	14	Medium	—
EIP-8279 Block Access List Byte Floor	PFI	2026-08-26	LLMChecklist v2	Complete	29	High	Yes
EIP-8279 Block Access List Byte Floor	PFI	Not recorded	HumanChecklist v2	Draft PR	22	Medium	—
EIP-8298 SETCODEFROM Code Reuse Instruction	PFI	2026-08-26	LLMChecklist v2	Complete	22	Medium	Yes
EIP-8304 Trustless log and transaction index	PFI	2026-08-26	LLMChecklist v2	Complete	30	High	Yes
EIP-8304 Trustless log and transaction index	PFI	Not recorded	HumanChecklist v2	Open PR	26	High	—
EIP-8368 CPSB Recalibration for New Gas Limit	PFI	2026-08-26	LLMChecklist v2	Complete	12	Medium	Yes
EIP-8368 CPSB Recalibration for New Gas Limit	PFI	Not recorded	HumanChecklist v2	Draft PR	16	Medium	—
EIP-8372 Normalized state gas limit	PFI	2026-08-26	LLMChecklist v2	Complete	19	Medium	Yes
EIP-8372 Normalized state gas limit	PFI	Not recorded	HumanChecklist v2	Draft PR	20	Medium	—

Scored proposals

Every scored assessment as a stacked complexity bar, ranked by total on one shared scale. Switch evaluator to rank the human checklists, or show both per EIP. The seven not-applicable entries remain in the table above.

Evaluator LLM (39) Human (25) Both, ranked by LLM

EIP-8141 Frame TransactionCFIChecklist revision 2
EIP-8250 Keyed Nonces for Frame TransactionsPFIChecklist revision 2
EIP-8272 Recent Roots for Frame TransactionsPFIChecklist revision 2
EIP-7807 SSZ execution blocksPFIChecklist revision 2
EIP-8304 Trustless log and transaction indexPFIChecklist revision 2
EIP-8237 Independent CL/EL SyncPFIChecklist revision 2
EIP-8279 Block Access List Byte FloorPFIChecklist revision 2
EIP-7906 Transaction Assertions via State Diff OpcodePFIChecklist revision 2
EIP-8200 EVMificationPFIChecklist revision 2
EIP-8148 Custom sweep threshold for validatorsPFIChecklist revision 2
EIP-8188 Last-Written Block for Accounts and SlotsPFIChecklist revision 2
EIP-8205 Withdrawal credentials preregistrationPFIChecklist revision 2
EIP-7851 Code-Controlled EOA DelegationPFIChecklist revision 2
EIP-7923 Linear, Page-Based Memory CostingPFIChecklist revision 2
EIP-8151 Account Code Restricted ecRecoverPFIChecklist revision 2
EIP-8298 SETCODEFROM Code Reuse InstructionPFIChecklist revision 2
EIP-7819 SETDELEGATE instructionPFIChecklist revision 2
EIP-8025 Optional Execution ProofsPFIChecklist revision 2
EIP-7709 Read BLOCKHASH from Storage and Update CostPFIChecklist revision 2
EIP-7805 Fork-choice enforced Inclusion Lists (FOCIL)SFIChecklist revision 2
EIP-8094 eth/vhash - Blob-Aware MempoolPFIChecklist revision 2
EIP-8146 Block Access List SidecarsPFIChecklist revision 2
EIP-8182 Private ETH and ERC-20 TransfersPFIChecklist revision 2
EIP-8253 Bump nonce of zero-nonce storage accountsPFIChecklist revision 2
EIP-8372 Normalized state gas limitPFIChecklist revision 2
EIP-8131 Unified Transaction Content FloorPFIChecklist revision 2
EIP-5920 PAY opcodePFIChecklist revision 2
EIP-7979 Call and Return Opcodes for the EVMPFIChecklist revision 2
EIP-8115 Batch priority fees at end of blockPFIChecklist revision 2
EIP-7666 EVM-ify the identity precompilePFIChecklist revision 2
EIP-8077 eth/XX - announce transactions with noncePFIChecklist revision 2
EIP-4758 Deactivate SELFDESTRUCTPFIChecklist revision 2
EIP-7862 Delayed State RootPFIChecklist revision 2
EIP-3298 Remove storage-clear refund and refund capPFIChecklist revision 2
EIP-8368 CPSB Recalibration for New Gas LimitPFIChecklist revision 2
EIP-7645 Alias ORIGIN to SENDERPFIChecklist revision 2
EIP-2488 Deprecate the CALLCODE opcodePFIChecklist revision 2
EIP-7668 Remove bloom filtersPFIChecklist revision 2
EIP-8116 Replace cumulative receipt fieldsPFIChecklist revision 2

Caveats

The original PFI-only result remains 776 across 37 scored EIPs and is not rewritten by this combined view.
EIP-7805 was SFI and EIP-8141 was CFI, rather than PFI, at the frozen 2026-08-26 snapshot.
Scores cover execution-layer and execution-client networking surfaces only; EIP-7805 consensus-layer work is not scored.
Proposal splitting and cross-EIP interactions can overlap complexity, so score sums are not additive implementation-effort estimates.
No post-snapshot proposal text, implementation evidence, outcomes, or later fork decisions were available to assessors.

Download all assessments Publication JSON

Criterion legend and glossary

Every stacked bar, comparison matrix, and criterion table on this site uses the same criterion colours, abbreviations, and order. Colour marks the criterion group; the abbreviation and name identify the criterion. Scores are 0–3 per criterion (4 is exceptional; cross-EIP interactions is uncapped).

EVM surface

Opcodes, precompiles, and system contracts that are added or modified.

Added opcodes
Introduces new opcodes
Modified opcodes
Modifies pre-existing opcodes
Added precompiles
Introduces new precompiles
Modified precompiles
Modifies pre-existing precompiles logic or gas-accounting
Added system contracts
Introduces new system contract, stateful or not
Modified system contracts
Modifies pre-existing system contracts

Gas and accounting

Execution, blob, and state gas rules, refunds, and where charges happen inside opcodes.

EVM Gas rule changes
New EVM gas accounting rules
State-access ordering within opcode execution · Checklist revision 2 only
Changes *where inside an opcode's execution* state is accessed, or where gas is charged relative to that access. Because a state access is recorded in the block-level access list only if execution had enough gas to reach it, this ordering is consensus-critical: moving it changes the BAL at every gas boundary of every affected opcode.
Blob gas accounting changes
New Blob gas accounting rules which potentially affect pre-existing tests
State gas accounting changes · Checklist revision 2 only
New state gas accounting rules. State gas is the cost of *writing* state, as opposed to accessing or executing it: `StateGasCosts`, `COST_PER_STATE_BYTE`, the block-level state gas budget, and the spill path into execution gas.
New EVM gas refund
New gas-refund mechanism

Blocks, transactions, and encoding

Transaction types and validity, block and header fields, encodings, syncing, and activation-time changes.

New transaction types
Introduces a new transaction type
New or modified transaction validity mechanisms
Creates new or modifies pre-existing transaction types' validation mechanisms
New block / header fields
Introduces new block or block header fields
Encoding changes (RLP/SSZ)
Introduces encoding changes at the transaction/block/interfaces level
Block syncing changes
Modifies block RLP validation mechanisms that require test client syncing.
New fork activation mechanism
Modifies state, internal variables, or similar, at the fork activation block

Client interfaces

Engine API and transition-tool interface changes.

Engine API changes
Introduces new fields to the Engine API directives
Engine API encoding changes · Checklist revision 1 only
Engine API encoding changes (the revision-1 template defines no anchor text for this row).
Transition-tool interface changes
Modifies or adds new fields to the transition tool interface.

Testing impact

Rework, new invariants, and new primitives required in the test framework.

Patterns affecting pre-existing tests
Implements a new validation mechanism or rule that translates in reworking pre-existing tests
New invariant on pre-existing tests · Checklist revision 2 only
Tests that are **not about this EIP** must nonetheless assert something this EIP produces. Their logic does not change; they gain a new thing to check.
New test-framework primitives · Checklist revision 2 only
Requires new abstractions in the test framework itself — expectation types, modifiers, helpers — beyond writing test functions with what already exists.

Risk and validation

Security, performance, boundary conditions, and cryptography that need validation.

Security risks
Introduces or modifies mechanisms that could compromise the security of the chain, users, validators, or other stakeholders, if not implemented properly.
Performance risks
Introduces or modifies mechanisms and requires performance validation.
Edge/boundary conditions
Feature contains edge/boundary conditions.
Cryptography
Introduces new cryptography mechanisms or modifies existing functionality that involves cryptography

Coordination

Cross-EIP interactions and behavior that clients must agree on before tests exist.

Cross-EIP interactions
Introduces or modifies mechanisms that affect other EIPs in either the same or past forks.
Unspecified behavior requiring cross-client consensus · Checklist revision 2 only
The EIP text does not determine the answer for cases a test can construct. Clients must agree on a previously unspecified detail before tests can be baselined. The cost here is coordination and re-baselining, not test writing.