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. The model supp…
Model details →OpenAI: GPT-5.1-Codex vs Relace: Relace Apply 3
OpenAI: GPT-5.1-Codex wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
Relace Apply 3 is a specialized code-patching LLM that merges AI-suggested edits straight into your source files. It can apply updates from GPT-4o, Claude, and others into your files at 10,000 tokens/sec on average. The model requires the …
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5.1-Codex | Relace: Relace Apply 3 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 400K | 256K | 🏆 OpenAI: GPT-5.1-Codex |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.25 | $0.85 | 🏆 Relace: Relace Apply 3 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $10.00 | $1.25 | 🏆 Relace: Relace Apply 3 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | — | 🏆 OpenAI: GPT-5.1-Codex |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 OpenAI: GPT-5.1-Codex |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 OpenAI: GPT-5.1-Codex |
Frequently asked questions
Is OpenAI: GPT-5.1-Codex better than Relace: Relace Apply 3?
OpenAI: GPT-5.1-Codex wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: GPT-5.1-Codex and Relace: Relace Apply 3?
Input: $1.25 vs $0.85 per 1M tokens. Output: $10.00 vs $1.25 per 1M tokens.
What context windows do OpenAI: GPT-5.1-Codex and Relace: Relace Apply 3 support?
OpenAI: GPT-5.1-Codex supports up to 400K tokens. Relace: Relace Apply 3 supports up to 256K tokens.
Do both OpenAI: GPT-5.1-Codex and Relace: Relace Apply 3 support tool calling?
OpenAI: GPT-5.1-Codex: yes. Relace: Relace Apply 3: not advertised.