Grok 4.20 vs Mistral Medium 3.5
Grok 4.20 vs Mistral Medium 3.5: Grok 4.20 is cheaper for input-heavy usage ($1.25/M vs $1.50/M input tokens), while Grok 4.20 is better for long-context tasks (2,000,000 tokens).
Direct answer: choose Grok 4.20 for lower token spend and choose Grok 4.20 when your workload needs longer context.
Compare input and output token pricing, context windows, and monthly cost estimates on one page so you can pick the cheaper model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Grok 4.20
Mistral Medium 3.5
Cost Differences
Mistral Medium 3.5 costs more than Grok 4.20
Quick Recommendation
Winner for direct API pricing: Grok 4.20. At the default workload, Grok 4.20 saves about $8.25/month ($100.375/year) versus Mistral Medium 3.5.
Feature Comparison
| Feature | Grok 4.20 | Mistral Medium 3.5 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Input Price | $1.25/1M tokens | $1.50/1M tokens |
| Output Price | $2.50/1M tokens | $7.50/1M tokens |
| Context Window | 2,000,000 tokens | 256,000 tokens |
| Max Output | 131,072 tokens | 32,768 tokens |
| Category | reasoning | flagship |
| Capabilities | textvisionreasoningcode | textvisioncodereasoning |
| Release Date | 2/17/2026 | 4/29/2026 |
Grok 4.20 vs Mistral Medium 3.5: Which Should You Choose?
Choosing between Grok 4.20 and Mistral Medium 3.5 depends on your priorities: cost efficiency, context length, or raw capability. Grok 4.20 is the more affordable option at $1.25/1M input tokens — 17% cheaper than Mistral Medium 3.5. Meanwhile, Grok 4.20 offers a significantly larger context window at 2,000,000 tokens vs 256,000 for Mistral Medium 3.5.
These models come from different providers — xAI and Mistral AI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with xAI, switching to Mistral AIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Grok 4.20 is a reasoning model while Mistral Medium 3.5 is flagship. This means they're optimized for different workloads. Grok 4.20 is built for complex tasks that require deeper reasoning, while Mistral Medium 3.5 offers better value for routine operations.
Output costs matter too. Grok 4.20 charges $2.50/1M output tokens vs $7.50 for Mistral Medium 3.5. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 4.20 has the edge here at $2.50/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Grok 4.20 when:
- • Budget is a primary concern
- • You need a larger context window (2,000,000 tokens)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using xAI's API ecosystem
Choose Mistral Medium 3.5 when:
- • You're already using Mistral AI's API ecosystem
Pros and Caveats at a Glance
Grok 4.20
- • Input pricing: $1.25/M tokens
- • Output pricing: $2.50/M tokens
- • Context window: 2,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Trade-offs are minor in this matchup.
Mistral Medium 3.5
- • Input pricing: $1.50/M tokens
- • Output pricing: $7.50/M tokens
- • Context window: 256,000 tokens
- • Max output: 32,768 tokens
Watch out for
- • Higher input cost than Grok 4.20
- • Higher output cost than Grok 4.20
- • Smaller context window than Grok 4.20
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Grok 4.20 (xAI)
Mistral Medium 3.5 (Mistral AI)
Start using Grok 4.20 today
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Sign Up for Mistral AI →Frequently Asked Questions
Which is cheaper, Grok 4.20 or Mistral Medium 3.5?▼
What is the context window difference between Grok 4.20 and Mistral Medium 3.5?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare xAI and Mistral AI API pricing beyond this model matchup?▼
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