Claude Sonnet 4.5 (59k thinking): benchmark scores, price and ranking
Claude Sonnet 4.5 (59k thinking) from Anthropic ranks #178 of 743 LLMs on the LLMs Tiger aggregate benchmark score (50.6), based on 3 benchmark results captured up to 2026-10-13.
- Organisation
- Anthropic
- Type
- Frontier model
- Open weights
- No
- Released
- 2025-09-29 (source: curated)
- Cheapest API price
- $3.00 in / $15.00 out per million tokens (via anthropic, observed 2026-10-13T20:47Z)
- Aggregate rank
- #178 of 743 (score 50.6)
Relative to other models, Claude Sonnet 4.5 (59k thinking) is strongest on GPQA Diamond (#96 of 275) and weakest on SimpleQA Verified (#50 of 69).
Across the 3 benchmarks where at least ten models are scored, Claude Sonnet 4.5 (59k thinking) is in the top 10% on 0 and in the top half on 2.
Its cheapest listed input price, $3.00 per million tokens, is lower than that of 11% of the 427 models with a listed price.
Claude Sonnet 4.5 (59k thinking) benchmark results
| Benchmark | Score | Rank | Source | Captured |
|---|---|---|---|---|
| GPQA Diamond | 82.3% | #96 of 275 | Epoch AI Benchmarking Hub | 2026-10-13 |
| OTIS Mock AIME | 77.8% | #68 of 189 | Epoch AI Benchmarking Hub | 2026-10-13 |
| SimpleQA Verified | 30.7% | #50 of 69 | Epoch AI Benchmarking Hub | 2026-10-13 |
About Claude Sonnet 4.5 (59k thinking)
Claude Sonnet 4.5 (59k thinking) is a frontier model from Anthropic. It was released on 2025-09-29, according to the developer's announcement. The cheapest API listing we track charges $3.00 per million input tokens and $15.00 per million output tokens, through anthropic. We hold 3 benchmark results for it across 2 areas, and none is in the top tenth of its board.
Where Claude Sonnet 4.5 (59k thinking) stands
On our aggregate score, Claude Sonnet 4.5 (59k thinking) is #178 of 743 ranked models, in the top quarter. Its score is 50.6; the scale is centred on 50, so it sits 0.6 points above the typical model. That beats 76% of the ranked field. Among the 70 ranked Anthropic models it is #29. The next one up is claude-opus-4-1-20250805_27K at 50.7. The next one down is Claude 3.7 Sonnet w/ Review Heavy at 50.5.
Claude Sonnet 4.5 (59k thinking), benchmark by benchmark
GPQA Diamond puts Claude Sonnet 4.5 (59k thinking) at 82.3%, #96 of 275. That beats 65% of the models tested, but 13.4 points short of GPT-6 Astra (max) (95.8%). The results either side are GPT-5.5 Instant (82.5%) and Qwen3.5 Flash (82.3%). It covers expert-level science questions. The board median is 71.7%, so Claude Sonnet 4.5 (59k thinking) is 10.6 points above it. Source: Epoch AI Benchmarking Hub, captured 2026-10-13.
On OTIS Mock AIME, Claude Sonnet 4.5 (59k thinking) reaches 77.8%. It ranks #68 of 189, ahead of 64% of the field, and 22.2 points behind Claude Fable 5.1 (max) at 100.0%. The results either side are GLM-5 (80.0%) and grok-3-mini-beta (high) (77.8%). It covers competition maths (AIME 2024-25 style). The board median is 57.8%, so Claude Sonnet 4.5 (59k thinking) is 20.0 points above it. Source: Epoch AI Benchmarking Hub, captured 2026-10-13.
Claude Sonnet 4.5 (59k thinking) lands below the middle on SimpleQA Verified: 30.7%, #50 of 69, with 71% of the field scoring higher. gemini-4-argon-high leads at 76.0%; the closest result above is GPT-4.1 at 31.1%. It covers short factual questions. The board median is 41.0%, so Claude Sonnet 4.5 (59k thinking) is 10.3 points below it. Source: Epoch AI Benchmarking Hub, captured 2026-10-13.
Strengths and weaknesses
Reasoning, maths and science: solid, ahead of 65% of the field on average across 2 benchmarks. Its best board here is GPQA Diamond (#96 of 275) and its weakest is OTIS Mock AIME (#68 of 189).
Price and value
The median input price across the 427 priced models is $0.500 per million tokens, so Claude Sonnet 4.5 (59k thinking) costs more than the typical listing. Models that score within 1.5 points or better and cost less: Qwen2.5-Coder-7B-Instruct ($0.010, 49.5), DeepSeek V4 Flash 0731 (max) ($0.016, 53.1), GLM-5.3-Flash (max) ($0.026, 49.6). Similar scores cost more on Muse Wonder (max) ($4.00) and gpt-4o-2024-05-13 ($5.00).
Release history
The Anthropic model released before it was Claude 4.5 Sonnet on 2025-09-29, which scores 51.2. The next one was claude-haiku-4-5-20251001_16K on 2025-10-01, at 49.5.
Reading these numbers
The 3 scores on this page come from 1 source: Epoch AI Benchmarking Hub (3). No official leaderboard supplied any of them, so treat them as third-party measurements. The leaderboard also lists 14 other reasoning-effort settings of this model, which redirect here. This page shows the highest. With 3 results the aggregate rank can move a lot when one new score arrives.
Claude Sonnet 4.5 (59k thinking) is also listed at 14 other reasoning-effort settings; this page shows the highest-effort row, which is the one the leaderboard keeps by default.
Models ranked nearby
- #175 qwen-2.5-72b-instruct (50.7)
- #176 gemini-exp-1206 (50.6)
- #177 MiniMax-Text-01 (50.6)
- #179 chatgpt-4o-01-29-2025 (50.6)
- #180 Gemini 3 Pro (50.6)
- #181 NVIDIA-Nemotron-3-Super-120B-A12B-FP8 (50.5)
More from Anthropic
- Claude Opus 5.5 (max) (#1, 64.3)
- Claude Fable 5.1 (max) (#3, 61.9)
- Claude Sonnet 5.5 (max) (#4, 60.8)
- Claude Opus 5 (max) (#8, 60.0)
- Claude Fable 5 (max) (#9, 59.9)
- claude-opus-4-8-xhigh-effort (#14, 56.6)
Compare it on the live leaderboard → · How the aggregate score works