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 Claude 4.6 SonnetAnthropic |  GPT-5.6 SolOpenAI | |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Family | Claude | GPT |
| Release date | 2026-02-17 | 2026-06-26 |
| Context window | 1,000,000 tokens | — |
| Parameters | — | — |
| Modality | text, vision | text, vision, audio |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context. | Flagship of OpenAI's GPT-5.6 three-model suite (Sol / Terra / Luna), released as a limited preview. Strong gains in coding, cybersecurity, biology, and long-horizon agentic work. Pricing: $5 / $30 per million input/output tokens. |
| Links | ||
| Benchmarks | ||
| MMLU-Pro | 85.4% | — |
| GPQA-D | 85.8% | — |
| HumanEval | 95.9% | — |
| Aider | 83.6% | — |
| AIME-25 | 87.4% | — |
| LiveCB | 73.8% | — |
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GPT-5.6 Sol✓Claude 4.8 Opus+
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Mistral Large 2+