OpenRouter: Fusion vs GPT-5.3 Codex
OpenRouter: Fusion is cheaper on output tokens, while OpenRouter: Fusion offers a larger context window. Choose OpenRouter: Fusion or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | OpenRouter: Fusion | GPT-5.3 Codex |
|---|---|---|
| Provider | OpenRouter | OpenRouter |
| Input / 1M tokens | $-1,000,000.00 | $1.75 |
| Output / 1M tokens | $-1,000,000.00 | $14.00 |
| Context window | 1M | 400K |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Feb 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.