ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Mistral Small 3.1 24B vs GPT-4o

Mistral Small 3.1 24B comes out ahead, 55 to 43 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Mistral AI

    Mistral Small 3.1 24B

    Released Mar 17, 2025

    55/100
    • ECI127.5
    • Price$0.229 / $0.436
    • Context128K
    Full specs Remove Mistral Small 3.1 24B

  2. OpenAI

    GPT-4o

    Released May 13, 2024

    43/100
    • ECI129.0
    • Price$2.50 / $10.00
    • Context128K
    Full specs Remove GPT-4o

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Mistral Small 3.1 24B is our pick

Mistral Small 3.1 24B is the better all-round choice, scoring 55/100 against GPT-4o (43). It leads on price. GPT-4o wins on capability and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-4oCapabilities Index (ECI): GPT-4o 129.0 · Mistral Small 3.1 24B 127.5
  • Lowest priceMistral Small 3.1 24BMistral Small 3.1 24B $0.281 · GPT-4o $4.38 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameMistral Small 3.1 24B 128,000 · GPT-4o 128,000 tokens
  • Widest inputsGPT-4oMistral Small 3.1 24B: Text, Images · GPT-4o: Text, Images, PDFs
  • Self-hostingMistral Small 3.1 24BPublishes downloadable weights
How the score is built
MeasureWeightMistral Small 3.1 24BGPT-4o
CapabilityCapabilities Index (ECI)50%5052
Price25%7619
Inputs & features15%6070
Context window10%2424
Overall100%55/10043/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Mistral Small 3.1 24B vs GPT-4o specifications side by side
SpecificationMistral Small 3.1 24BMistral AIGPT-4oOpenAI
Capability
Capabilities Index (ECI)127.5129.0 (best)
ECI rank#132 of 148#129 of 148 (best)
GPQA DiamondGraduate-level science questions47.5%48.9% (best)
OTIS Mock AIME 2024–2025Competition mathematics5.8%6.3% (best)
Price per million tokens
Input$0.229 (best)$2.50
Output$0.436 (best)$10.00
Cached input—$1.25
Blended (3:1)$0.281 (best)$4.38
Long-context rateSame rateSame rate
Price sourceMedian of 2 providersOfficial OpenAI API
Limits
Context window128,000 tokens128,000 tokens
Max output16,384 tokens16,384 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoNoNo
ReasoningNoNo
Tool callingYesYes
Structured outputYesYes
Availability
WeightsOpenProprietary
API model ID—gpt-4o
API providers219 (best)
ReleasedMar 17, 2025May 13, 2024
Knowledge cutoffJun 2024Sep 2023
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Mistral Small 3.1 24B$3.16
  • GPT-4o$45.00
04 — Questions

Which should you choose?

Which is better: Mistral Small 3.1 24B or GPT-4o?

Mistral Small 3.1 24B is the better all-round choice, scoring 55/100 against GPT-4o (43). It leads on price. GPT-4o wins on capability and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Mistral Small 3.1 24B or GPT-4o?

Mistral Small 3.1 24B is cheaper at $0.229 input / $0.436 output per million tokens (median across 2 API providers). GPT-4o costs $2.50 input / $10.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.281 per million tokens for Mistral Small 3.1 24B versus $4.38 for GPT-4o (16× as much).

Which scores higher on benchmarks?

GPT-4o scores higher on the Capabilities Index (ECI): GPT-4o 129.0 (#129 of 148) and Mistral Small 3.1 24B 127.5 (#132 of 148). The confidence ranges of the top two overlap (124.2–131.5 vs 122.6–129.4), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT-4o 48.9%, Mistral Small 3.1 24B 47.5%; OTIS Mock AIME 2024–2025 — GPT-4o 6.3%, Mistral Small 3.1 24B 5.8%.

Which is better for coding?

There are no published SWE-bench Verified results for Mistral Small 3.1 24B and GPT-4o yet, so there is no like-for-like coding score. On overall capability, GPT-4o leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Mistral Small 3.1 24B and GPT-4o share the same 128,000-token context window. Maximum output per response: Mistral Small 3.1 24B up to 16,384, GPT-4o up to 16,384 tokens.

Which can read images, PDFs, audio or video?

Mistral Small 3.1 24B accepts text and images; GPT-4o accepts text, images and PDFs. GPT-4o 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 is proprietary.

Which is newer?

Mistral Small 3.1 24B is the newest, released Mar 17, 2025. GPT-4o came out May 13, 2024. Knowledge cutoff: Mistral Small 3.1 24B Jun 2024, GPT-4o Sep 2023.

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.

05 — Keep comparing

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