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AI models / Compare
GPT-5.6 Sol: OpenAI's GPT-5.6 flagship for complex professional work; the gpt-5.6 alias routes here. Claude Opus 5.5: Anthropic's recommended starting model, for long-running agentic coding and knowledge work.
| Spec | GPT-5.6 Sol | Claude Opus 5.5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| API model ID | gpt-5.6-sol | claude-opus-5-5 |
| API price (standard) | $4.00 in / $20.00 out per 1M tokens | $4.00 in / $20.00 out per 1M tokens |
| Pricing note | Promotional price, available at least through Nov 21, 2026. Prompts over 272K input tokens are billed at 2x input and 1.5x output. | Batch API is 50% off. |
| Context window | 1.05M tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens |
| Weights | Closed (API only) | Closed (API only) |
Figures from each provider's official docs, checked 2026-10-26. Benchmarks and real-world quality vary by task, so test both on your own prompts.