Claude Mythos 5.1 vs Gemini 3 Flash

Pricing verdict: Claude Mythos 5.1 vs Gemini 3 Flash: Gemini 3 Flash is cheaper for input-heavy usage ($0.50/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 Gemini 3 Flash 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

Google

Gemini 3 Flash

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Claude Mythos 5.1 pricing page Gemini 3 Flash pricing page Anthropic provider overview Google 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

Gemini 3 Flash

Per Request:$0.002000

Daily:$0.20

Monthly:$6.00

Yearly:$73.00

Cost Differences

$0.033

Per Request

$3.30

Daily

$99.00

Monthly

$1,204.50

Yearly

Gemini 3 Flash costs less than Claude Mythos 5.1

Quick Recommendation

Winner for direct API pricing: Gemini 3 Flash. At the default workload, Gemini 3 Flash saves about $99.00/month ($1,204.50/year) versus Claude Mythos 5.1.

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Feature Comparison

Feature	Claude Mythos 5.1	Gemini 3 Flash
Provider	Anthropic	Google
Input Price	$10.00/1M tokens	$0.50/1M tokens
Output Price	$50.00/1M tokens	$3.00/1M tokens
Context Window	1,000,000 tokens	1,000,000 tokens
Max Output	128,000 tokens	65,536 tokens
Category	flagship	efficient
Capabilities	textvisionreasoningcode	textvisionaudiocode
Release Date	9/1/2026	12/17/2025

Claude Mythos 5.1 vs Gemini 3 Flash: Which Should You Choose?

Choosing between Claude Mythos 5.1 and Gemini 3 Flash depends on your priorities: cost efficiency, context length, or raw capability. Gemini 3 Flash is the more affordable option at $0.50/1M input tokens — 95% cheaper than Claude Mythos 5.1.

These models come from different providers — Anthropic and Google — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to Googleinvolves 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 Gemini 3 Flash is efficient. This means they're optimized for different workloads. Claude Mythos 5.1 is built for complex tasks that require deeper reasoning, while Gemini 3 Flash offers better value for routine operations.

Output costs matter too. Claude Mythos 5.1 charges $50.00/1M output tokens vs $3.00 for Gemini 3 Flash. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Gemini 3 Flash has the edge here at $3.00/1M 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 Claude Mythos 5.1 when:

• You need longer outputs (up to 128,000 tokens)
• You're already using Anthropic's API ecosystem

Choose Gemini 3 Flash when:

• Budget is a primary concern
• You're already using Google'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 Gemini 3 Flash
• Higher output cost than Gemini 3 Flash

Gemini 3 Flash

• Input pricing: $0.50/M tokens
• Output pricing: $3.00/M tokens
• Context window: 1,000,000 tokens
• Max output: 65,536 tokens

Watch out for

• Trade-offs are minor in this matchup.

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

Claude Mythos 5.1 (Anthropic)

Cost Calculator

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Input Tokens

Output Tokens

Requests/Day

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Gemini 3 Flash (Google)

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

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Start using Claude Mythos 5.1 today

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Frequently Asked Questions

Which is cheaper, Claude Mythos 5.1 or Gemini 3 Flash?▼

Gemini 3 Flash is cheaper for input tokens at $0.50 per million tokens vs $10.00 for Claude Mythos 5.1 — that's 95% savings on input costs.

What is the context window difference between Claude Mythos 5.1 and Gemini 3 Flash?▼

Claude Mythos 5.1 supports 1,000,000 tokens while Gemini 3 Flash supports 1,000,000 tokens — a difference of 0 tokens in favor of Claude Mythos 5.1.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Gemini 3 Flash is the lower-cost option, while Claude Mythos 5.1 offers a larger context window (1,000,000 vs 1,000,000 tokens). Choose Gemini 3 Flash 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 Gemini 3 Flash costs about $6.00/month. Overall, Gemini 3 Flash has lower combined input + output rates ($0.50 in, $3.00 out) vs Claude Mythos 5.1.

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

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