Side-by-side technical and economic comparison between OpenAI's OpenAI o3 and Mistral AI's Mistral Large 3.
| Metric | OpenAI o3 | Mistral Large 3 | Advantage |
|---|---|---|---|
| Provider Organization | OpenAI | Mistral AI | — |
| Standard Input / 1M | $2.00 | $0.50 | Mistral Large 3 (75% lower) |
| Cached Input / 1M | $0.50 | $0.05 | Mistral Large 3 lower |
| Output / 1M | $8.00 | $1.50 | Mistral Large 3 lower |
| Context Window | 200k | 256k | Mistral Large 3 (256k) |
| Max Generation Tokens | 100k | 16.4k | OpenAI o3 |
| Tokenizer Family | OpenAI o200k_base (200k vocabulary) | Mistral Tekken Tokenizer (131k vocabulary) | — |
Opt for OpenAI o3 when your engineering requirements prioritize OpenAI's ecosystem, specific tokenizer efficiencies (Exact BPE (o200k_base)), or when your expected prompt-to-completion ratios favor its $2/M input rate.
Opt for Mistral Large 3 when looking for Mistral AI's tooling integration, specific context window depth (256k tokens), or when output generation volume favors its $1.5/M rate.