Updated daily at 05:00 UTC
- Released
- 28 Sep 2026
- Status
- Current
- Context
- 1M
- Max output
- 128K
- Input per 1M tokens
- $2.00
- Output per 1M tokens
- $10.00
- Open weights
- No
- License
- proprietary
- Parameters
- —
- Knowledge cutoff
- Jun 2026
- Reasoning
- Yes
- Modalities
- text, image → text
Category scores
Out of 100, from independent and third-party results only, by method category-2026-09-29.1.
| Category | Score | Rank | Coverage |
|---|---|---|---|
| Coding & software engineering | 52.1 | Not ranked | 1 of 5 |
Benchmark results
Every result we hold for this model, with who ran it and where it was published.
Coding & software engineering
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| FrontierCode | Main score (Mean@5) | 52.1% | Third party | xhigh | — | https://cognition.com/frontiercode via Epoch AI |
Professional knowledge work
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| APEX-Agents | Pass@1 (all rubric criteria met) | 75.5% | Source not stated | max | — | Epoch AI via Epoch AI |
| APEX-Agents | Pass@1 (all rubric criteria met) | 44.6% | Source not stated | medium | — | Epoch AI via Epoch AI |
Other Claude Sonnet versions
- Claude Sonnet 530 Jun 2026
- Claude Sonnet 4.617 Feb 2026
- Claude Sonnet 4.529 Sep 2025
- Claude Sonnet 422 May 2025
- Claude 3.7 Sonnet24 Feb 2025
- Claude 3.5 Sonnet20 Jun 2024
- Claude 3 Sonnet4 Mar 2024