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A side-by-side comparison of Claude Sonnet 5.5 and OpenAI: GPT-5.3-Codex, using the lowest price and highest limits found across every provider that offers each model.
| Claude Sonnet 5.5 | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Providers | 55 | 41 |
| Cheapest input ($/M) | $0.2 via Api.Airforce | $0.1504 via QiHang AI |
| Cheapest output ($/M) | $1 via Api.Airforce | $1.2031 via QiHang AI |
| Max context | 1M | 512K |
| Max output | 1M | 128K |
| Released | Sep 26, 2026 | Feb 5, 2026 |
| Open weights | No | No |
| Features | ReasoningToolsStructured outputFiles | ReasoningToolsStructured outputFiles |
| Input modalities | FileImageText | ImageText |
| Output modalities | Text | Text |