Claude Mythos 5.1 vs Devstral 2

Pricing verdict: Claude Mythos 5.1 vs Devstral 2: Devstral 2 is cheaper for input-heavy usage ($0.40/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 Devstral 2 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.

Anthropic

Claude Mythos 5.1

Mistral AI

Devstral 2

Try Anthropic →Try Mistral AI →

Claude Mythos 5.1 pricing page Devstral 2 pricing page Anthropic provider overview Mistral AI provider overview

Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

Claude Mythos 5.1

Per Request:$0.035

Daily:$3.50

Monthly:$105.00

Yearly:$1,277.50

Devstral 2

Per Request:$0.001400

Daily:$0.14

Monthly:$4.20

Yearly:$51.10

Cost Differences

$0.0336

Per Request

$3.36

Daily

$100.80

Monthly

$1,226.40

Yearly

Devstral 2 costs less than Claude Mythos 5.1

Quick Recommendation

Winner for direct API pricing: Devstral 2. At the default workload, Devstral 2 saves about $100.80/month ($1,226.40/year) versus Claude Mythos 5.1.

Claude Mythos 5.1 full pricing breakdown Devstral 2 full pricing breakdown Anthropic API pricing details Mistral AI API pricing details Anthropic vs Mistral AI API pricing GPT-6 Astra vs Claude Fable 5.1 GPT-6 Astra vs Claude Mythos 5.1

Feature Comparison

Feature	Claude Mythos 5.1	Devstral 2
Provider	Anthropic	Mistral AI
Input Price	$10.00/1M tokens	$0.40/1M tokens
Output Price	$50.00/1M tokens	$2.00/1M tokens
Context Window	1,000,000 tokens	262,144 tokens
Max Output	128,000 tokens	32,768 tokens
Category	flagship	efficient
Capabilities	textvisionreasoningcode	textcode
Release Date	9/1/2026	12/9/2025

Claude Mythos 5.1 vs Devstral 2: Which Should You Choose?

Choosing between Claude Mythos 5.1 and Devstral 2 depends on your priorities: cost efficiency, context length, or raw capability. Devstral 2 is the more affordable option at $0.40/1M input tokens — 96% cheaper than Claude Mythos 5.1. Meanwhile, Claude Mythos 5.1 offers a significantly larger context window at 1,000,000 tokens vs 262,144 for Devstral 2.

These models come from different providers — Anthropic and Mistral AI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to Mistral AIinvolves 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 Devstral 2 is efficient. This means they're optimized for different workloads. Claude Mythos 5.1 is built for complex tasks that require deeper reasoning, while Devstral 2 offers better value for routine operations.

Output costs matter too. Claude Mythos 5.1 charges $50.00/1M output tokens vs $2.00 for Devstral 2. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Devstral 2 has the edge here at $2.00/1M output tokens.

Multimodal capabilities: Claude Mythos 5.1 supports vision (image inputs) while Devstral 2 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, reasoning)
• You need longer outputs (up to 128,000 tokens)
• You're already using Anthropic's API ecosystem

Choose Devstral 2 when:

• Budget is a primary concern
• You're already using Mistral AI'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 Devstral 2
• Higher output cost than Devstral 2

Devstral 2

• Input pricing: $0.40/M tokens
• Output pricing: $2.00/M tokens
• Context window: 262,144 tokens
• Max output: 32,768 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)

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

Select a provider and model to see costs

Devstral 2 (Mistral AI)

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

Select a provider and model to see costs

Start using Claude Mythos 5.1 today

Start using Devstral 2 today

Frequently Asked Questions

Which is cheaper, Claude Mythos 5.1 or Devstral 2?▼

Devstral 2 is cheaper for input tokens at $0.40 per million tokens vs $10.00 for Claude Mythos 5.1 — that's 96% savings on input costs.

What is the context window difference between Claude Mythos 5.1 and Devstral 2?▼

Claude Mythos 5.1 supports 1,000,000 tokens while Devstral 2 supports 262,144 tokens — a difference of 737,856 tokens in favor of Claude Mythos 5.1.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Devstral 2 is the lower-cost option, while Claude Mythos 5.1 offers a larger context window (1,000,000 vs 262,144 tokens). Choose Devstral 2 for budget sensitivity or Claude Mythos 5.1 for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, Claude Mythos 5.1 costs about $105.00/month and Devstral 2 costs about $4.20/month. Overall, Devstral 2 has lower combined input + output rates ($0.40 in, $2.00 out) vs Claude Mythos 5.1.

Where can I compare Anthropic and Mistral AI API pricing beyond this model matchup?▼

See the Anthropic vs Mistral AI provider comparison page for lineup-level averages, then review each model page for exact per-token rates.