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#98 Claude Opus 4.6

Anthropic · Claude Opus 4.6

Released: · Source

Text; Coding; Reasoning

Use cases
Coding, Reasoning, Text
Accepts
No verified data
Produces
No verified data

Access

Anthropic · API Computing: Cloud

Price USD

ProviderPrice USDConditions
Anthropic · API$0.5 / 1M cache-read tokensStandard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026
Anthropic · API$6.25 / 1M cache-write tokensStandard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026
Anthropic · API$5 / 1M input tokensStandard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026
Anthropic · API$25 / 1M output tokensStandard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026

Evaluator & score

Epoch AI · ECI155.34

Composite index · published model-group index · 20.09.2026 · Higher is better

Snapshot: 2026-09-20 · 90% CI [153.7, 157.21]

Official Epoch AI index; combines own, third-party and developer-reported results. It is not a safety audit or a media-generation score.

Conditions

Epoch Capabilities Index; official model-group estimates

Official ECI model scores, Epoch AI, CC BY 4.0. Composite of own, third-party and developer-reported results. 90% bootstrap interval. Not a per-effort score; export date is the model release date, not measurement date. Methodology: https://epoch.ai/eci#documentation

Epoch AI · Chess Puzzles14 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Chess Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Chess Puzzles; version: claude-opus-4-6_max; mode: max; source id: FF8iU7vP5ecg6PdvDyE7XG; file: chess_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.08.2026

Epoch AI · Chess Puzzles13 %

Independent run · thinking budget 120K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Chess Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Chess Puzzles; version: claude-opus-4-6_120K; mode: thinking budget 120K; source id: EUknGXXh3f2mHtv3dTufLg; file: chess_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 20.02.2026

Epoch AI · Chess Puzzles17 %

Independent run · thinking budget 32K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Chess Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Chess Puzzles; version: claude-opus-4-6_32K; mode: thinking budget 32K; source id: amkBg66TZcYjF26HaRAXfs; file: chess_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · Chess Puzzles10 %

Independent run · thinking budget 64K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Chess Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Chess Puzzles; version: claude-opus-4-6_64K; mode: thinking budget 64K; source id: k5CCeHstJwo5wKpbMFZtfw; file: chess_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · EBR-bench12.698 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

EBR-bench; Epoch AI own run; best score across scorers

Epoch AI own run; EBR-bench; version: claude-opus-4-6_max; mode: max; source id: XSESb7YgzSTRENEhjHxuwc; file: ebr_bench.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 29.06.2026

Epoch AI · FrontierMath38.276 %

Independent run · default (effort unspecified by source) · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-2025-02-28-Private; version: claude-opus-4-6; mode: default (effort unspecified by source); source id: nFxCq7MqCfKjhxKr7hT9qr; file: frontiermath.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 05.02.2026

Epoch AI · FrontierMath40.7 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-2025-02-28-Private; version: claude-opus-4-6_max; mode: max; source id: Y4von2jMmwvEK5MuNw9pSt; file: frontiermath.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 12.02.2026

Epoch AI · FrontierMath40 %

Independent run · thinking budget 32K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-2025-02-28-Private; version: claude-opus-4-6_32K; mode: thinking budget 32K; source id: b2iuVcuCPEau2ryhBsjhS9; file: frontiermath.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · FrontierMath39.655 %

Independent run · thinking budget 64K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-2025-02-28-Private; version: claude-opus-4-6_64K; mode: thinking budget 64K; source id: QSNvJqsvYdNbb85DyL9AXn; file: frontiermath.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · FrontierMath-Tier-4-2025-07-01-Private14.583 %

Independent run · default (effort unspecified by source) · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath-Tier-4-2025-07-01-Private; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-Tier-4-2025-07-01-Private; version: claude-opus-4-6; mode: default (effort unspecified by source); source id: nvXhiYKL9RDVDfHWw53zFT; file: frontiermath_tier_4.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 05.02.2026

Epoch AI · FrontierMath-Tier-4-2025-07-01-Private22.9 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath-Tier-4-2025-07-01-Private; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-Tier-4-2025-07-01-Private; version: claude-opus-4-6_max; mode: max; source id: SfehtojAZdZxu7BLgPLDYA; file: frontiermath_tier_4.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 12.02.2026

Epoch AI · FrontierMath-Tier-4-2025-07-01-Private20.833 %

Independent run · thinking budget 32K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath-Tier-4-2025-07-01-Private; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-Tier-4-2025-07-01-Private; version: claude-opus-4-6_32K; mode: thinking budget 32K; source id: UVXUd6ZFnQTci66adkFepy; file: frontiermath_tier_4.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · FrontierMath-Tier-4-2025-07-01-Private20.833 %

Independent run · thinking budget 64K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath-Tier-4-2025-07-01-Private; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-Tier-4-2025-07-01-Private; version: claude-opus-4-6_64K; mode: thinking budget 64K; source id: mAeSEYBeiSU5vUhrnsP6Uj; file: frontiermath_tier_4.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · FrontierMath-Tier-4-v2-Private26.829 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath-Tier-4-v2-Private; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-Tier-4-v2-Private; version: claude-opus-4-6_max; mode: max; source id: 2hbbp8z6PhB7c2T33os9q5; file: frontiermath_tier_4_v2.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 11.06.2026

Epoch AI · FrontierMath-Tiers-1-3-v2-Private65.965 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

FrontierMath-Tiers-1-3-v2-Private; Epoch AI own run; best score across scorers

Epoch AI own run; FrontierMath-Tiers-1-3-v2-Private; version: claude-opus-4-6_max; mode: max; source id: kgJ2d6XbKj3dZutDcBYSKU; file: frontiermath_tiers_1_3_v2.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 11.06.2026

Epoch AI · GPQA Diamond88.384 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

GPQA Diamond; Epoch AI own run; best score across scorers

Epoch AI own run; source version: claude-opus-4-6_max; file: gpqa_diamond.csv; row: JcQMgXdZKU54u52B8TGQKp.

Measurement date: 06.08.2026

Epoch AI · GPQA Diamond90.53 %

Independent run · thinking budget 32K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

GPQA Diamond; Epoch AI own run; best score across scorers

Epoch AI own run; GPQA diamond; version: claude-opus-4-6_32K; mode: thinking budget 32K; source id: DiXCMhdfhcjaCUSzYWgACy; file: gpqa_diamond.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · GPQA Diamond88.763 %

Independent run · thinking budget 64K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

GPQA Diamond; Epoch AI own run; best score across scorers

Epoch AI own run; GPQA diamond; version: claude-opus-4-6_64K; mode: thinking budget 64K; source id: eB9e2mtd5nRwqdFyLEsz6k; file: gpqa_diamond.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · Mock AIME 2024/202591.111 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Mock AIME 2024/2025; Epoch AI own run; best score across scorers

Epoch AI own run; source version: claude-opus-4-6_max; file: otis_mock_aime_2024_2025.csv; row: coxYk5vK5cBhQ7iZohMtA5.

Measurement date: 06.08.2026

Epoch AI · Mock AIME 2024/202593.056 %

Independent run · thinking budget 32K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Mock AIME 2024/2025; Epoch AI own run; best score across scorers

Epoch AI own run; OTIS Mock AIME 2024-2025; version: claude-opus-4-6_32K; mode: thinking budget 32K; source id: kZ3VgrQJxfKQ5msjpmSaAz; file: otis_mock_aime_2024_2025.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · Mock AIME 2024/202594.444 %

Independent run · thinking budget 64K · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Mock AIME 2024/2025; Epoch AI own run; best score across scorers

Epoch AI own run; OTIS Mock AIME 2024-2025; version: claude-opus-4-6_64K; mode: thinking budget 64K; source id: TUPC8VdX4jApFa4MGfNP4t; file: otis_mock_aime_2024_2025.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.02.2026

Epoch AI · Mystery Game Puzzles15 %

Independent run · default (effort unspecified by source) · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Mystery Game Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Mystery Game Puzzles; version: claude-opus-4-6; mode: default (effort unspecified by source); source id: BbM4xbJcS5sjrzZABGg8K7; file: mystery_game_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.08.2026

Epoch AI · Mystery Game Puzzles7 %

Independent run · low · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Mystery Game Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Mystery Game Puzzles; version: claude-opus-4-6_low; mode: low; source id: JarZHkwUMZ6HuA4ArMNT45; file: mystery_game_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 06.08.2026

Epoch AI · Mystery Game Puzzles25 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

Mystery Game Puzzles; Epoch AI own run; best score across scorers

Epoch AI own run; Mystery Game Puzzles; version: claude-opus-4-6_max; mode: max; source id: 64rokFyL2L8Vd4SZVdayCy; file: mystery_game_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 25.07.2026

Epoch AI · SWE-bench Verified78.719 %

Independent run · default (effort unspecified by source) · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

SWE-bench Verified; Epoch AI own run; best score across scorers

Epoch AI own run; SWE-Bench verified; version: claude-opus-4-6; mode: default (effort unspecified by source); source id: 2hH2GAPUFaJR7pfVKhhicg; file: swe_bench_verified.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 18.02.2026

Epoch AI · SWE-bench Verified75.62 %

Independent run · default (effort unspecified by source) · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

SWE-bench Verified; Epoch AI own run; best score across scorers

Epoch AI own run; SWE-Bench verified; version: claude-opus-4-6; mode: default (effort unspecified by source); source id: aQiAg6mt8HPHXjKcJvax2d; file: swe_bench_verified.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 10.02.2026

Epoch AI · SimpleQA Verified47 %

Independent run · max · 20.09.2026 · Higher is better

Snapshot: 2026-09-20

Conditions

SimpleQA Verified; Epoch AI own run; best score across scorers

Epoch AI own run; SimpleQA Verified; version: claude-opus-4-6_max; mode: max; source id: 85fhMxLaebWtLoi6oLpTbi; file: simpleqa_verified.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.

Measurement date: 27.08.2026

SourceVerified 18.09.2026