Claude Sonnet 4.5 (unknown thinking)
ModelActiveby Anthropic · family “claude-sonnet-unknown-thinking”
Epoch Capabilities Index
Not scored by Epoch AI
Released
29 Sep 2025
Context window
Unknown
Max output
Unknown
Input $ / 1M tokens
Unknown
Output $ / 1M tokens
Unknown
Cached input $ / 1M
Unknown
Each benchmark shown separately with its own source
Benchmark results (9)
| Benchmark | Domain | Score | vs best recorded | Setting | Run | Source |
|---|---|---|---|---|---|---|
| LMCA | agents | 38.8% | 59% | unknown | — | External ↗ |
| DTBench | reasoning | 83.2% | 85% | unknown | — | External ↗ |
| ProofBench | math | 19.0% | 19% | unknown | — | External ↗ |
| Remote Labor Index | agents | 2.1% | 10% | unknown | — | External ↗ |
| GSO-Bench | coding | 14.7% | 31% | unknown | — | External ↗ |
| Terminal Bench | agents | 46.5% ±2.4 | 55% | agent: CAMEL-AI | 29 Sep 2025 | External ↗ |
| HLE | knowledge | 13.7% | 25% | unknown | — | External ↗ |
| SimpleBench | reasoning | 54.3% | 66% | unknown | — | External ↗ |
| Cybench | coding | 60.0% | 65% | unknown | — | External ↗ |
Source: Epoch AI Benchmarking Hub (CC BY 4.0). “External” rows are leaderboard results Epoch collects from third parties. Best reported setting per benchmark is shown.
API list price over time
Price history
$ per 1M tokens
No data recorded for this period
0 observations (OpenRouter listing). History accumulates with every ingest run; a single point means no change has been observed yet.
Events
- Model launch12mo agoAnthropic releases Claude Sonnet 4.5 (unknown thinking)Epoch AI Benchmarking Hub