Claude Opus 4 vs Pixtral 12B vs o3-pro
Pixtral 12B comes out ahead, 64 to 27 and 27 on our weighted score, and it is the cheaper option too.
AnthropicClaude Opus 4
27/100- ECI142.7
- Price$15.00 / $75.00
- Context200K
- Our pick
Mistral AIPixtral 12B
64/100- ECI—
- Price$0.15 / $0.15
- Context128K
OpenAIo3-pro
27/100- ECI147.4
- Price$20.00 / $80.00
- Context200K
Pixtral 12B is our pick
Pixtral 12B is the better all-round choice, scoring 64/100 against Claude Opus 4 (27) and o3-pro (27). It leads on price. 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 · Claude Opus 4 $30.00 · o3-pro $35.00 per 1M tokens (3:1 blend)
- Longest contextClaude Opus 4 and o3-proClaude Opus 4 200,000 · o3-pro 200,000 · Pixtral 12B 128,000 tokens
- Widest inputsClaude Opus 4Claude Opus 4: Text, Images, PDFs · Pixtral 12B: Text, Images · o3-pro: Text, Images
- Self-hostingPixtral 12BPublishes downloadable weights
| Measure | Weight | Claude Opus 4 | Pixtral 12B | o3-pro |
|---|---|---|---|---|
| Price | 50% | 0 | 89 | 0 |
| Inputs & features | 30% | 70 | 50 | 70 |
| Context window | 20% | 32 | 24 | 32 |
| Overall | 100% | 27/100 | 64/100 | 27/100 |
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 | Claude Opus 4Anthropic | Pixtral 12BMistral AI | o3-proOpenAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 142.7 | — | 147.4 (best) |
| ECI rank | #87 of 148 | — | #60 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 76.3% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 64.4% | — | — |
| SWE-bench VerifiedFixing real GitHub issues | 70.7% | — | — |
| Price per million tokens | |||
| Input | $15.00 | $0.15 (best) | $20.00 |
| Output | $75.00 | $0.15 (best) | $80.00 |
| Cached input | — | — | — |
| Blended (3:1) | $30.00 | $0.15 (best) | $35.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 5 providers | Official Mistral API | Official OpenAI API |
| Limits | |||
| Context window | 200,000 tokens (best) | 128,000 tokens | 200,000 tokens (best) |
| Max output | 32,000 tokens | 128,000 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 | Yes | No | Yeslow · medium · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | — | pixtral-12b | o3-pro |
| API providers | 5 | 4 | 6 (best) |
| Released | May 22, 2025 | Sep 1, 2024 | Jun 10, 2025 |
| Knowledge cutoff | Mar 31, 2025 | Sep 2024 | 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.
- Claude Opus 4$300.00
- Pixtral 12B$1.80
- o3-pro$360.00
Which should you choose?
Which is better: Claude Opus 4, Pixtral 12B or o3-pro?
Pixtral 12B is the better all-round choice, scoring 64/100 against Claude Opus 4 (27) and o3-pro (27). It leads on price. 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, Claude Opus 4, Pixtral 12B or o3-pro?
Pixtral 12B is cheaper at $0.15 input / $0.15 output per million tokens (official Mistral API price). Claude Opus 4 costs $15.00 input / $75.00 output per million tokens (median across 5 API providers); 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 $0.15 per million tokens for Pixtral 12B versus $30.00 for Claude Opus 4 (200× as much) and $35.00 for o3-pro (233× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Claude Opus 4 has an ECI of 142.7, Pixtral 12B has not been scored yet and o3-pro has an ECI of 147.4.
Which is better for coding?
There are no published SWE-bench Verified results for Pixtral 12B and o3-pro 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?
Claude Opus 4 and o3-pro have the largest context windows (200,000 and 200,000 tokens), against 128,000 for Pixtral 12B. Maximum output per response: Claude Opus 4 up to 32,000, Pixtral 12B up to 128,000, o3-pro up to 100,000 tokens.
Which can read images, PDFs, audio or video?
Claude Opus 4 accepts text, images and PDFs; Pixtral 12B accepts text and images; o3-pro accepts text and images. Claude Opus 4 handles the widest range of inputs.
Are any of these open source?
Pixtral 12B publishes its weights and can be self-hosted; Claude Opus 4 and o3-pro is proprietary.
Which is newer?
o3-pro is the newest, released Jun 10, 2025. Claude Opus 4 came out May 22, 2025; Pixtral 12B came out Sep 1, 2024. Knowledge cutoff: Claude Opus 4 Mar 31, 2025, Pixtral 12B Sep 2024, 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.
