Gemini 2.5 Pro vs o3 vs Pixtral 12B
Pixtral 12B comes out ahead, 64 to 54 and 42 on our weighted score, and it is the cheaper option too.
GoogleGemini 2.5 Pro
54/100- ECI145.3
- Price$1.25 / $10.00
- Context1.05M
OpenAIo3
42/100- ECI146.9
- Price$2.00 / $8.00
- Context200K
- Our pick
Mistral AIPixtral 12B
64/100- ECI—
- Price$0.15 / $0.15
- Context128K
Pixtral 12B is our pick
Pixtral 12B is the better all-round choice, scoring 64/100 against Gemini 2.5 Pro (54) and o3 (42). It leads on price. Gemini 2.5 Pro 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 pricePixtral 12BPixtral 12B $0.15 · Gemini 2.5 Pro $3.44 · o3 $3.50 per 1M tokens (3:1 blend)
- Longest contextGemini 2.5 ProGemini 2.5 Pro 1,048,576 · o3 200,000 · Pixtral 12B 128,000 tokens
- Widest inputsGemini 2.5 ProGemini 2.5 Pro: Text, Images, PDFs, Audio, Video · o3: Text, Images, PDFs · Pixtral 12B: Text, Images
- Self-hostingPixtral 12BPublishes downloadable weights
| Measure | Weight | Gemini 2.5 Pro | o3 | Pixtral 12B |
|---|---|---|---|---|
| Price | 50% | 24 | 24 | 89 |
| Inputs & features | 30% | 100 | 80 | 50 |
| Context window | 20% | 61 | 32 | 24 |
| Overall | 100% | 54/100 | 42/100 | 64/100 |
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 | Gemini 2.5 ProGoogle | o3OpenAI | Pixtral 12BMistral AI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 145.3 | 146.9 (best) | — |
| ECI rank | #78 of 148 | #63 of 148 (best) | — |
| GPQA DiamondGraduate-level science questions | 85.3% (best) | 81.8% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 24.6% | 33.3% (best) | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 84.7% (best) | 84.4% | — |
| SWE-bench VerifiedFixing real GitHub issues | 57.6% | 62.3% (best) | — |
| SimpleQA VerifiedShort factual questions | — | 49.4% | — |
| Price per million tokens | |||
| Input | $1.25 | $2.00 | $0.15 (best) |
| Output | $10.00 | $8.00 | $0.15 (best) |
| Cached input | $0.125 (best) | $0.50 | — |
| Blended (3:1) | $3.44 | $3.50 | $0.15 (best) |
| Long-context rate | Over 200K: $2.50 / $15.00 | Same rate | Same rate |
| Price source | Official Google API | Official OpenAI API | Official Mistral API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 200,000 tokens | 128,000 tokens |
| Max output | 65,536 tokens | 100,000 tokens | 128,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | No |
| Audio | Yes | No | No |
| Video | Yes | No | No |
| Reasoning | Yes | Yeslow · medium · high | No |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Open |
| API model ID | gemini-2.5-pro | o3 | pixtral-12b |
| API providers | 22 (best) | 18 | 4 |
| Released | Jun 17, 2025 | Apr 16, 2025 | Sep 1, 2024 |
| Knowledge cutoff | Jan 2025 | May 2024 | Sep 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 2.5 Pro$32.50
- o3$36.00
- Pixtral 12B$1.80
Which should you choose?
Which is better: Gemini 2.5 Pro, o3 or Pixtral 12B?
Pixtral 12B is the better all-round choice, scoring 64/100 against Gemini 2.5 Pro (54) and o3 (42). It leads on price. Gemini 2.5 Pro 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, Gemini 2.5 Pro, o3 or Pixtral 12B?
Pixtral 12B is cheaper at $0.15 input / $0.15 output per million tokens (official Mistral API price). Gemini 2.5 Pro costs $1.25 input / $10.00 output per million tokens (official Google API price); o3 costs $2.00 input / $8.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.15 per million tokens for Pixtral 12B versus $3.44 for Gemini 2.5 Pro (23× as much) and $3.50 for o3 (23× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Gemini 2.5 Pro has an ECI of 145.3, o3 has an ECI of 146.9 and Pixtral 12B has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Pixtral 12B yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
Gemini 2.5 Pro has the largest context window at 1,048,576 tokens, against 200,000 for o3 and 128,000 for Pixtral 12B. Maximum output per response: Gemini 2.5 Pro up to 65,536, o3 up to 100,000, Pixtral 12B up to 128,000 tokens.
Which can read images, PDFs, audio or video?
Gemini 2.5 Pro accepts text, images, PDFs, audio and video; o3 accepts text, images and PDFs; Pixtral 12B accepts text and images. Gemini 2.5 Pro handles the widest range of inputs.
Are any of these open source?
Pixtral 12B publishes its weights and can be self-hosted; Gemini 2.5 Pro and o3 is proprietary.
Which is newer?
Gemini 2.5 Pro is the newest, released Jun 17, 2025. o3 came out Apr 16, 2025; Pixtral 12B came out Sep 1, 2024. Knowledge cutoff: Gemini 2.5 Pro Jan 2025, o3 May 2024, Pixtral 12B Sep 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.
