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AI models / Compare
GPT-5.3-Codex: OpenAI's model optimized for agentic coding in Codex and similar environments. Claude Sonnet 5.5: Anthropic's balance of speed and intelligence.
| Spec | GPT-5.3-Codex | Claude Sonnet 5.5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| API model ID | gpt-5.3-codex | claude-sonnet-5-5 |
| API price (standard) | $1.75 in / $14.00 out per 1M tokens | $2.00 in / $10.00 out per 1M tokens |
| Pricing note | Standard tier; Fast mode is $3.50 in / $28.00 out. | Batch API is 50% off. |
| Context window | 400K 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.