GPT-4o mini vs Claude Haiku 3.5 vs Mistral Small 3.1 24B
Too close to call on our weighted score (GPT-4o mini 50, Claude Haiku 3.5 49, Mistral Small 3.1 24B 48). The right pick depends on what you value most.
OpenAIGPT-4o mini
50/100- ECI126.6
- Price$0.15 / $0.60
- Context128K
AnthropicClaude Haiku 3.5
49/100- ECI127.2
- Price—
- Context200K
Mistral AIMistral Small 3.1 24B
48/100- ECI127.5
- Price$0.229 / $0.436
- Context128K
Too close to call
It is close. Our weighted score puts them within a point (GPT-4o mini 50/100, Claude Haiku 3.5 49/100, Mistral Small 3.1 24B 48/100), so choose by what matters most for your work: Mistral Small 3.1 24B for raw capability, GPT-4o mini on price and Claude Haiku 3.5 for long inputs. The score weighs capability 67%, inputs & features 20%, context window 13%.
- CapabilityMistral Small 3.1 24BCapabilities Index (ECI): Mistral Small 3.1 24B 127.5 · Claude Haiku 3.5 127.2 · GPT-4o mini 126.6
- Lowest priceGPT-4o miniGPT-4o mini $0.263 · Mistral Small 3.1 24B $0.281 per 1M tokens (3:1 blend) · Claude Haiku 3.5 unpriced
- Longest contextClaude Haiku 3.5Claude Haiku 3.5 200,000 · GPT-4o mini 128,000 · Mistral Small 3.1 24B 128,000 tokens
- Widest inputsGPT-4o mini and Claude Haiku 3.5GPT-4o mini: Text, Images, PDFs · Claude Haiku 3.5: Text, Images, PDFs · Mistral Small 3.1 24B: Text, Images
- Self-hostingMistral Small 3.1 24BPublishes downloadable weights
| Measure | Weight | GPT-4o mini | Claude Haiku 3.5 | Mistral Small 3.1 24B |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 67% | 49 | 49 | 50 |
| Inputs & features | 20% | 70 | 60 | 60 |
| Context window | 13% | 24 | 32 | 24 |
| Overall | 100% | 50/100 | 49/100 | 48/100 |
Left out because at least one model lacks the data: price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-4o miniOpenAI | Claude Haiku 3.5Anthropic | Mistral Small 3.1 24BMistral AI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 126.6 | 127.2 | 127.5 (best) |
| ECI rank | #135 of 148 | #134 of 148 | #132 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 37.7% | 38.1% | 47.5% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | 0.7% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 6.9% (best) | 4.3% | 5.8% |
| SimpleQA VerifiedShort factual questions | 8.3% | — | — |
| Price per million tokens | |||
| Input | $0.15 (best) | — | $0.229 |
| Output | $0.60 | — | $0.436 (best) |
| Cached input | $0.075 | — | — |
| Blended (3:1) | $0.263 (best) | — | $0.281 |
| Long-context rate | Same rate | — | Same rate |
| Price source | Official OpenAI API | — | Median of 2 providers |
| Limits | |||
| Context window | 128,000 tokens | 200,000 tokens (best) | 128,000 tokens |
| Max output | 16,384 tokens (best) | 8,192 tokens | 16,384 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | No | No | No |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Open |
| API model ID | gpt-4o-mini | — | — |
| API providers | 21 (best) | — | 2 |
| Released | Jul 18, 2024 | Oct 22, 2024 | Mar 17, 2025 |
| Knowledge cutoff | Sep 2023 | Jul 31, 2024 | Jun 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-4o mini$2.70
- Claude Haiku 3.5—
- Mistral Small 3.1 24B$3.16
Which should you choose?
Which is better: GPT-4o mini, Claude Haiku 3.5 or Mistral Small 3.1 24B?
It is close. Our weighted score puts them within a point (GPT-4o mini 50/100, Claude Haiku 3.5 49/100, Mistral Small 3.1 24B 48/100), so choose by what matters most for your work: Mistral Small 3.1 24B for raw capability, GPT-4o mini on price and Claude Haiku 3.5 for long inputs. The score weighs capability 67%, inputs & features 20%, context window 13%.
Which is cheaper, GPT-4o mini, Claude Haiku 3.5 or Mistral Small 3.1 24B?
GPT-4o mini is cheaper at $0.15 input / $0.60 output per million tokens (official OpenAI API price). Mistral Small 3.1 24B costs $0.229 input / $0.436 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $0.263 per million tokens for GPT-4o mini versus $0.281 for Mistral Small 3.1 24B (1.1× as much). Claude Haiku 3.5 has no published per-token price.
Which scores higher on benchmarks?
Mistral Small 3.1 24B scores higher on the Capabilities Index (ECI): Mistral Small 3.1 24B 127.5 (#132 of 148), Claude Haiku 3.5 127.2 (#134 of 148) and GPT-4o mini 126.6 (#135 of 148). The confidence ranges of the top two overlap (122.6–129.4 vs 120.7–129.7), so treat the gap as small. On individual benchmarks: GPQA Diamond — Mistral Small 3.1 24B 47.5%, Claude Haiku 3.5 38.1%, GPT-4o mini 37.7%; OTIS Mock AIME 2024–2025 — GPT-4o mini 6.9%, Mistral Small 3.1 24B 5.8%, Claude Haiku 3.5 4.3%.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-4o mini, Claude Haiku 3.5 and Mistral Small 3.1 24B yet, so there is no like-for-like coding score. On overall capability, Mistral Small 3.1 24B 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?
Claude Haiku 3.5 has the largest context window at 200,000 tokens, against 128,000 for GPT-4o mini and 128,000 for Mistral Small 3.1 24B. Maximum output per response: GPT-4o mini up to 16,384, Claude Haiku 3.5 up to 8,192, Mistral Small 3.1 24B up to 16,384 tokens.
Which can read images, PDFs, audio or video?
GPT-4o mini accepts text, images and PDFs; Claude Haiku 3.5 accepts text, images and PDFs; Mistral Small 3.1 24B accepts text and images. GPT-4o mini handles the widest range of inputs.
Are any of these open source?
Mistral Small 3.1 24B publishes its weights and can be self-hosted; GPT-4o mini and Claude Haiku 3.5 is proprietary.
Which is newer?
Mistral Small 3.1 24B is the newest, released Mar 17, 2025. Claude Haiku 3.5 came out Oct 22, 2024; GPT-4o mini came out Jul 18, 2024. Knowledge cutoff: GPT-4o mini Sep 2023, Claude Haiku 3.5 Jul 31, 2024, Mistral Small 3.1 24B Jun 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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