Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding…
Model details →Anthropic: Claude Opus 4.5 vs OpenAI: GPT-5.2-Codex
OpenAI: GPT-5.2-Codex wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex 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 …
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.5 | OpenAI: GPT-5.2-Codex | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 400K | 🏆 OpenAI: GPT-5.2-Codex |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $1.75 | 🏆 OpenAI: GPT-5.2-Codex |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | $14.00 | 🏆 OpenAI: GPT-5.2-Codex |
| 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 Anthropic: Claude Opus 4.5 better than OpenAI: GPT-5.2-Codex?
OpenAI: GPT-5.2-Codex wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Opus 4.5 and OpenAI: GPT-5.2-Codex?
Input: $5.00 vs $1.75 per 1M tokens. Output: $25.00 vs $14.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.5 and OpenAI: GPT-5.2-Codex support?
Anthropic: Claude Opus 4.5 supports up to 200K tokens. OpenAI: GPT-5.2-Codex supports up to 400K tokens.
Do both Anthropic: Claude Opus 4.5 and OpenAI: GPT-5.2-Codex support tool calling?
Anthropic: Claude Opus 4.5: yes. OpenAI: GPT-5.2-Codex: yes.