GPT-5-Codex vs Mistral Large 3
Mistral Large 3 comes out ahead, 50 to 42 on our weighted score, and it is the cheaper option too.
OpenAIGPT-5-Codex
42/100- ECI—
- Price$1.25 / $10.00
- Context400K
- Our pick
Mistral AIMistral Large 3
50/100- ECI—
- Price$0.50 / $1.50
- Context262K
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Make it a three-way comparison.
Mistral Large 3 is our pick
Mistral Large 3 is the better all-round choice, scoring 50/100 against GPT-5-Codex (42). It leads on price. GPT-5-Codex wins on inputs & features and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceMistral Large 3Mistral Large 3 $0.75 · GPT-5-Codex $3.44 per 1M tokens (3:1 blend)
- Longest contextGPT-5-CodexGPT-5-Codex 400,000 · Mistral Large 3 262,144 tokens
- Widest inputsSame inputsGPT-5-Codex: Text, Images · Mistral Large 3: Text, Images
- Self-hostingMistral Large 3Publishes downloadable weights
| Measure | Weight | GPT-5-Codex | Mistral Large 3 |
|---|---|---|---|
| Price | 50% | 24 | 56 |
| Inputs & features | 30% | 70 | 50 |
| Context window | 20% | 44 | 37 |
| Overall | 100% | 42/100 | 50/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5-CodexOpenAI | Mistral Large 3Mistral AI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $1.25 | $0.50 (best) |
| Output | $10.00 | $1.50 (best) |
| Cached input | — | $0.05 |
| Blended (3:1) | $3.44 | $0.75 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 3 providers | Official Mistral API |
| Limits | ||
| Context window | 400,000 tokens (best) | 262,144 tokens |
| Max output | 128,000 tokens | 262,144 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| Structured output | Yes | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | — | mistral-large-2512 |
| API providers | 3 | 13 (best) |
| Released | Sep 15, 2025 | Dec 2, 2025 |
| Knowledge cutoff | Sep 30, 2024 | Nov 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5-Codex$32.50
- Mistral Large 3$8.00
Which should you choose?
Which is better: GPT-5-Codex or Mistral Large 3?
Mistral Large 3 is the better all-round choice, scoring 50/100 against GPT-5-Codex (42). It leads on price. GPT-5-Codex wins on inputs & features and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GPT-5-Codex or Mistral Large 3?
Mistral Large 3 is cheaper at $0.50 input / $1.50 output per million tokens (official Mistral API price). GPT-5-Codex costs $1.25 input / $10.00 output per million tokens (median across 3 API providers). At a typical mix of three input tokens to one output token, that is $0.75 per million tokens for Mistral Large 3 versus $3.44 for GPT-5-Codex (4.6× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT-5-Codex has not been scored yet and Mistral Large 3 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5-Codex and Mistral Large 3 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
GPT-5-Codex has the largest context window at 400,000 tokens, against 262,144 for Mistral Large 3. Maximum output per response: GPT-5-Codex up to 128,000, Mistral Large 3 up to 262,144 tokens.
Which can read images, PDFs, audio or video?
GPT-5-Codex accepts text and images; Mistral Large 3 accepts text and images. They handle the same number of input types.
Are any of these open source?
Mistral Large 3 publishes its weights and can be self-hosted; GPT-5-Codex is proprietary.
Which is newer?
Mistral Large 3 is the newest, released Dec 2, 2025. GPT-5-Codex came out Sep 15, 2025. Knowledge cutoff: GPT-5-Codex Sep 30, 2024, Mistral Large 3 Nov 2024.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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