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 GPT-5.6 SolOpenAI | GPT-5.5 OpenAI |  Claude 4.6 SonnetAnthropic | |
|---|---|---|---|
| Vendor | OpenAI | OpenAI | Anthropic |
| Family | GPT | GPT | Claude |
| Release date | 2026-06-26 | 2026-04-23 | 2026-02-17 |
| Context window | — | 400,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision, audio | text, vision |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | 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. | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. | 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. |
| Links | |||
| Benchmarks | |||
| MMLU-Pro | — | 87.6% | 85.4% |
| GPQA-D | — | 89.4% | 85.8% |
| HumanEval | — | 96.8% | 95.9% |
| Aider | — | 89.7% | 83.6% |
| AIME-25 | — | 94.2% | 87.4% |
| LiveCB | — | 78.9% | 73.8% |
| MMMU | — | 78.4% | — |
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GPT-5.6 Sol✓Claude 4.8 Opus+
Qwen3.7-Max+
Gemini 3.5 Flash+Gemini 3.5+Gemini Omni+GPT-5.5✓
DeepSeek-V4-Flash+Gemini 3 Pro+DeepSeek-V4-Pro+Qwen3.6-27B+Claude 4.7 Opus+Claude 4.6 Sonnet✓Claude 4.5 Haiku+DeepSeek-V3.1+GPT-5 Pro+GPT-5+
Grok 4+Gemini 2.5 Flash+Qwen3 235B+o3+GPT-4.1+
Llama 4 Scout+Llama 4 Maverick+Gemini 2.5 Pro+DeepSeek-R1+
Mistral Large 2+