ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Mistral Medium 3 vs Grok 4.3

Grok 4.3 comes out ahead, 67 to 53 on our weighted score, though Mistral Medium 3 is 2× cheaper per token.

  1. Mistral AI

    Mistral Medium 3

    Released May 7, 2025

    53/100
    • ECI134.1
    • Price$0.40 / $2.00
    • Context131K
    Full specs Remove Mistral Medium 3
  2. Our pick

    xAI

    Grok 4.3

    Released Apr 17, 2026

    67/100
    • ECI149.2
    • Price$1.25 / $2.50
    • Context1M
    Full specs Remove Grok 4.3

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Grok 4.3 is our pick

Grok 4.3 is the better all-round choice, scoring 67/100 against Mistral Medium 3 (53). It leads on capability, inputs & features and context window. Mistral Medium 3 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGrok 4.3Capabilities Index (ECI): Grok 4.3 149.2 · Mistral Medium 3 134.1
  • Lowest priceMistral Medium 3Mistral Medium 3 $0.80 · Grok 4.3 $1.56 per 1M tokens (3:1 blend)
  • Longest contextGrok 4.3Grok 4.3 1,000,000 · Mistral Medium 3 131,072 tokens
  • Widest inputsGrok 4.3Mistral Medium 3: Text, Images · Grok 4.3: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightMistral Medium 3Grok 4.3
CapabilityCapabilities Index (ECI)50%5877
Price25%5441
Inputs & features15%5080
Context window10%2460
Overall100%53/10067/100
02 — Side by side

Every spec in one table

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

Mistral Medium 3 vs Grok 4.3 specifications side by side
SpecificationMistral Medium 3Mistral AIGrok 4.3xAI
Capability
Capabilities Index (ECI)134.1149.2 (best)
ECI rank#117 of 148#55 of 148 (best)
GPQA DiamondGraduate-level science questions59.5%88.8% (best)
FrontierMath Tiers 1–3Research-level mathematics—42.8%
OTIS Mock AIME 2024–2025Competition mathematics32.2%93.3% (best)
SimpleQA VerifiedShort factual questions—33.2%
Price per million tokens
Input$0.40 (best)$1.25
Output$2.00 (best)$2.50
Cached input—$0.20
Blended (3:1)$0.80 (best)$1.56
Long-context rateSame rateOver 200K: $2.50 / $5.00
Price sourceOfficial Mistral APIOfficial xAI API
Limits
Context window131,072 tokens1,000,000 tokens (best)
Max output131,072 tokens (best)30,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoNoNo
ReasoningNoYeslow · medium · high
Tool callingYesYes
Structured outputNoYes
Availability
WeightsProprietaryProprietary
API model IDmistral-medium-2505grok-4.3
API providers527 (best)
ReleasedMay 7, 2025Apr 17, 2026
Knowledge cutoffMay 2025—
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 Medium 3$8.00
  • Grok 4.3$17.50
04 — Questions

Which should you choose?

Which is better: Mistral Medium 3 or Grok 4.3?

Grok 4.3 is the better all-round choice, scoring 67/100 against Mistral Medium 3 (53). It leads on capability, inputs & features and context window. Mistral Medium 3 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Mistral Medium 3 or Grok 4.3?

Mistral Medium 3 is cheaper at $0.40 input / $2.00 output per million tokens (official Mistral API price). Grok 4.3 costs $1.25 input / $2.50 output per million tokens (official xAI API price). At a typical mix of three input tokens to one output token, that is $0.80 per million tokens for Mistral Medium 3 versus $1.56 for Grok 4.3 (2× as much).

Which scores higher on benchmarks?

Grok 4.3 scores higher on the Capabilities Index (ECI): Grok 4.3 149.2 (#55 of 148) and Mistral Medium 3 134.1 (#117 of 148). Their confidence ranges do not overlap (147.6–150.8 vs 130.5–135.6), so the gap is a real one. On individual benchmarks: GPQA Diamond — Grok 4.3 88.8%, Mistral Medium 3 59.5%; OTIS Mock AIME 2024–2025 — Grok 4.3 93.3%, Mistral Medium 3 32.2%.

Which is better for coding?

There are no published SWE-bench Verified results for Mistral Medium 3 and Grok 4.3 yet, so there is no like-for-like coding score. On overall capability, Grok 4.3 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?

Grok 4.3 has the largest context window at 1,000,000 tokens, against 131,072 for Mistral Medium 3. Maximum output per response: Mistral Medium 3 up to 131,072, Grok 4.3 up to 30,000 tokens.

Which can read images, PDFs, audio or video?

Mistral Medium 3 accepts text and images; Grok 4.3 accepts text, images and PDFs. Grok 4.3 handles the widest range of inputs.

Are any of these open source?

No. Mistral Medium 3 and Grok 4.3 are proprietary and only available through APIs and apps.

Which is newer?

Grok 4.3 is the newest, released Apr 17, 2026. Mistral Medium 3 came out May 7, 2025. Knowledge cutoff: Mistral Medium 3 May 2025.

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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