Claude Mythos 5.1 vs Grok 3 Mini
Pricing verdict: Claude Mythos 5.1 vs Grok 3 Mini: Grok 3 Mini is cheaper for input-heavy usage ($0.30/M vs $10.00/M input tokens), while Claude Mythos 5.1 is better for long-context tasks (1,000,000 tokens).
Direct answer: choose Grok 3 Mini for lower token spend and choose Claude Mythos 5.1 when your workload needs longer context.
Compare API pricing, input and output token costs, context windows, and monthly estimates on one page so you can pick the right model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Claude Mythos 5.1
Grok 3 Mini
Cost Differences
Grok 3 Mini costs less than Claude Mythos 5.1
Quick Recommendation
Winner for direct API pricing: Grok 3 Mini. At the default workload, Grok 3 Mini saves about $103.35/month ($1,257.425/year) versus Claude Mythos 5.1.
Feature Comparison
| Feature | Claude Mythos 5.1 | Grok 3 Mini |
|---|---|---|
| Provider | Anthropic | xAI |
| Input Price | $10.00/1M tokens | $0.30/1M tokens |
| Output Price | $50.00/1M tokens | $0.50/1M tokens |
| Context Window | 1,000,000 tokens | 128,000 tokens |
| Max Output | 128,000 tokens | 131,072 tokens |
| Category | flagship | efficient |
| Capabilities | textvisionreasoningcode | textreasoningcode |
| Release Date | 9/1/2026 | 2/17/2025 |
Claude Mythos 5.1 vs Grok 3 Mini: Which Should You Choose?
Choosing between Claude Mythos 5.1 and Grok 3 Mini depends on your priorities: cost efficiency, context length, or raw capability. Grok 3 Mini is the more affordable option at $0.30/1M input tokens — 97% cheaper than Claude Mythos 5.1. Meanwhile, Claude Mythos 5.1 offers a significantly larger context window at 1,000,000 tokens vs 128,000 for Grok 3 Mini.
These models come from different providers — Anthropic and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Claude Mythos 5.1 is a flagship model while Grok 3 Mini is efficient. This means they're optimized for different workloads. Claude Mythos 5.1 is built for complex tasks that require deeper reasoning, while Grok 3 Mini offers better value for routine operations.
Output costs matter too. Claude Mythos 5.1 charges $50.00/1M output tokens vs $0.50 for Grok 3 Mini. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 3 Mini has the edge here at $0.50/1M output tokens.
Multimodal capabilities: Claude Mythos 5.1 supports vision (image inputs) while Grok 3 Mini is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose Claude Mythos 5.1 when:
- • You need a larger context window (1,000,000 tokens)
- • You need more capabilities (vision)
- • You're already using Anthropic's API ecosystem
Choose Grok 3 Mini when:
- • Budget is a primary concern
- • You need longer outputs (up to 131,072 tokens)
- • You're already using xAI's API ecosystem
- • You're running high-volume, latency-sensitive workloads
Pros and Caveats at a Glance
Claude Mythos 5.1
- • Input pricing: $10.00/M tokens
- • Output pricing: $50.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 128,000 tokens
Watch out for
- • Higher input cost than Grok 3 Mini
- • Higher output cost than Grok 3 Mini
Grok 3 Mini
- • Input pricing: $0.30/M tokens
- • Output pricing: $0.50/M tokens
- • Context window: 128,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Smaller context window than Claude Mythos 5.1
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude Mythos 5.1 (Anthropic)
Grok 3 Mini (xAI)
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Sign Up for xAI →Frequently Asked Questions
Which is cheaper, Claude Mythos 5.1 or Grok 3 Mini?▼
What is the context window difference between Claude Mythos 5.1 and Grok 3 Mini?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare Anthropic and xAI API pricing beyond this model matchup?▼
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