GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Model details →OpenAI: GPT-5.1-Codex vs Anthropic Claude Sonnet Latest
OpenAI: GPT-5.1-Codex and Anthropic Claude Sonnet Latest are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
This model always redirects to the latest model in the Anthropic Claude Sonnet family.
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5.1-Codex | Anthropic Claude Sonnet Latest | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 400K | 1M | 🏆 Anthropic Claude Sonnet Latest |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.25 | $2.00 | 🏆 OpenAI: GPT-5.1-Codex |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $10.00 | $10.00 | Tie |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is OpenAI: GPT-5.1-Codex better than Anthropic Claude Sonnet Latest?
OpenAI: GPT-5.1-Codex and Anthropic Claude Sonnet Latest are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between OpenAI: GPT-5.1-Codex and Anthropic Claude Sonnet Latest?
Input: $1.25 vs $2.00 per 1M tokens. Output: $10.00 vs $10.00 per 1M tokens.
What context windows do OpenAI: GPT-5.1-Codex and Anthropic Claude Sonnet Latest support?
OpenAI: GPT-5.1-Codex supports up to 400K tokens. Anthropic Claude Sonnet Latest supports up to 1M tokens.
Do both OpenAI: GPT-5.1-Codex and Anthropic Claude Sonnet Latest support tool calling?
OpenAI: GPT-5.1-Codex: yes. Anthropic Claude Sonnet Latest: yes.
Compare OpenAI: GPT-5.1-Codex with other models
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