Grok 4.3 vs Mistral Medium 3
Grok 4.3 comes out ahead, 67 to 53 on our weighted score, though Mistral Medium 3 is 2× cheaper per token.
- Our pick
xAIGrok 4.3
67/100- ECI149.2
- Price$1.25 / $2.50
- Context1M
Mistral AIMistral Medium 3
53/100- ECI134.1
- Price$0.40 / $2.00
- Context131K
Add a model
Make it a three-way comparison.
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 4.3Grok 4.3: Text, Images, PDFs · Mistral Medium 3: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Grok 4.3 | Mistral Medium 3 |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 77 | 58 |
| Price | 25% | 41 | 54 |
| Inputs & features | 15% | 80 | 50 |
| Context window | 10% | 60 | 24 |
| Overall | 100% | 67/100 | 53/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Grok 4.3xAI | Mistral Medium 3Mistral AI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 149.2 (best) | 134.1 |
| ECI rank | #55 of 148 (best) | #117 of 148 |
| GPQA DiamondGraduate-level science questions | 88.8% (best) | 59.5% |
| FrontierMath Tiers 1–3Research-level mathematics | 42.8% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 93.3% (best) | 32.2% |
| SimpleQA VerifiedShort factual questions | 33.2% | — |
| Price per million tokens | ||
| Input | $1.25 | $0.40 (best) |
| Output | $2.50 | $2.00 (best) |
| Cached input | $0.20 | — |
| Blended (3:1) | $1.56 | $0.80 (best) |
| Long-context rate | Over 200K: $2.50 / $5.00 | Same rate |
| Price source | Official xAI API | Official Mistral API |
| Limits | ||
| Context window | 1,000,000 tokens (best) | 131,072 tokens |
| Max output | 30,000 tokens | 131,072 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yeslow · medium · high | No |
| Tool calling | Yes | Yes |
| Structured output | Yes | No |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | grok-4.3 | mistral-medium-2505 |
| API providers | 27 (best) | 5 |
| Released | Apr 17, 2026 | May 7, 2025 |
| Knowledge cutoff | — | May 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Grok 4.3$17.50
- Mistral Medium 3$8.00
Which should you choose?
Which is better: Grok 4.3 or Mistral Medium 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, Grok 4.3 or Mistral Medium 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 Grok 4.3 and Mistral Medium 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: Grok 4.3 up to 30,000, Mistral Medium 3 up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Grok 4.3 accepts text, images and PDFs; Mistral Medium 3 accepts text and images. Grok 4.3 handles the widest range of inputs.
Are any of these open source?
No. Grok 4.3 and Mistral Medium 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.
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