GPT-4.1 mini vs Mistral Medium 3 vs o3-pro
GPT-4.1 mini comes out ahead, 60 to 53 and 51 on our weighted score, and it is the cheaper option too.
- Our pick
OpenAIGPT-4.1 mini
60/100- ECI135.0
- Price$0.40 / $1.60
- Context1.05M
Mistral AIMistral Medium 3
53/100- ECI134.1
- Price$0.40 / $2.00
- Context131K
- OpenAI
o3-pro
51/100- ECI147.4
- Price$20.00 / $80.00
- Context200K
GPT-4.1 mini is our pick
GPT-4.1 mini is the better all-round choice, scoring 60/100 against Mistral Medium 3 (53) and o3-pro (51). It leads on price and context window. o3-pro wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- Capabilityo3-proCapabilities Index (ECI): o3-pro 147.4 · GPT-4.1 mini 135.0 · Mistral Medium 3 134.1
- Lowest priceGPT-4.1 miniGPT-4.1 mini $0.70 · Mistral Medium 3 $0.80 · o3-pro $35.00 per 1M tokens (3:1 blend)
- Longest contextGPT-4.1 miniGPT-4.1 mini 1,047,576 · o3-pro 200,000 · Mistral Medium 3 131,072 tokens
- Widest inputsGPT-4.1 miniGPT-4.1 mini: Text, Images, PDFs · Mistral Medium 3: Text, Images · o3-pro: Text, Images
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | GPT-4.1 mini | Mistral Medium 3 | o3-pro |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 59 | 58 | 75 |
| Price | 25% | 57 | 54 | 0 |
| Inputs & features | 15% | 70 | 50 | 70 |
| Context window | 10% | 61 | 24 | 32 |
| Overall | 100% | 60/100 | 53/100 | 51/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-4.1 miniOpenAI | Mistral Medium 3Mistral AI | o3-proOpenAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 135.0 | 134.1 | 147.4 (best) |
| ECI rank | #115 of 148 | #117 of 148 | #60 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 65.9% (best) | 59.5% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 6.7% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 44.7% (best) | 32.2% | — |
| SimpleQA VerifiedShort factual questions | 12.7% | — | — |
| Price per million tokens | |||
| Input | $0.40 (best) | $0.40 (best) | $20.00 |
| Output | $1.60 (best) | $2.00 | $80.00 |
| Cached input | $0.10 | — | — |
| Blended (3:1) | $0.70 (best) | $0.80 | $35.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official OpenAI API | Official Mistral API | Official OpenAI API |
| Limits | |||
| Context window | 1,047,576 tokens (best) | 131,072 tokens | 200,000 tokens |
| Max output | 32,768 tokens | 131,072 tokens (best) | 100,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | No | No | Yeslow · medium · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | gpt-4.1-mini | mistral-medium-2505 | o3-pro |
| API providers | 24 (best) | 5 | 6 |
| Released | Apr 14, 2025 | May 7, 2025 | Jun 10, 2025 |
| Knowledge cutoff | Apr 2024 | May 2025 | May 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-4.1 mini$7.20
- Mistral Medium 3$8.00
- o3-pro$360.00
Which should you choose?
Which is better: GPT-4.1 mini, Mistral Medium 3 or o3-pro?
GPT-4.1 mini is the better all-round choice, scoring 60/100 against Mistral Medium 3 (53) and o3-pro (51). It leads on price and context window. o3-pro wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-4.1 mini, Mistral Medium 3 or o3-pro?
GPT-4.1 mini is cheaper at $0.40 input / $1.60 output per million tokens (official OpenAI API price). Mistral Medium 3 costs $0.40 input / $2.00 output per million tokens (official Mistral API price); o3-pro costs $20.00 input / $80.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.70 per million tokens for GPT-4.1 mini versus $0.80 for Mistral Medium 3 (1.1× as much) and $35.00 for o3-pro (50× as much).
Which scores higher on benchmarks?
o3-pro scores higher on the Capabilities Index (ECI): o3-pro 147.4 (#60 of 148), GPT-4.1 mini 135.0 (#115 of 148) and Mistral Medium 3 134.1 (#117 of 148). Their confidence ranges do not overlap (145.8–149.7 vs 131.2–136.6), so the gap is a real one.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-4.1 mini, Mistral Medium 3 and o3-pro yet, so there is no like-for-like coding score. On overall capability, o3-pro leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.
Which has the bigger context window?
GPT-4.1 mini has the largest context window at 1,047,576 tokens, against 200,000 for o3-pro and 131,072 for Mistral Medium 3. Maximum output per response: GPT-4.1 mini up to 32,768, Mistral Medium 3 up to 131,072, o3-pro up to 100,000 tokens.
Which can read images, PDFs, audio or video?
GPT-4.1 mini accepts text, images and PDFs; Mistral Medium 3 accepts text and images; o3-pro accepts text and images. GPT-4.1 mini handles the widest range of inputs.
Are any of these open source?
No. GPT-4.1 mini, Mistral Medium 3 and o3-pro are proprietary and only available through APIs and apps.
Which is newer?
o3-pro is the newest, released Jun 10, 2025. Mistral Medium 3 came out May 7, 2025; GPT-4.1 mini came out Apr 14, 2025. Knowledge cutoff: GPT-4.1 mini Apr 2024, Mistral Medium 3 May 2025, o3-pro May 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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