Model Comparison

Gemini 3.1 Pro vs Claude Mythos PreviewWhich is better in 2026?

Claude Mythos Preview significantly outperforms across most benchmarks. Gemini 3.1 Pro is 8.9x cheaper per token.

Verdict: Gemini 3.1 Pro vs Claude Mythos Preview — which is better?

Gemini 3.1 Pro (by Google) and Claude Mythos Preview (by Anthropic) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Gemini 3.1 Pro outperforms in 0 benchmarks, while Claude Mythos Preview is better at 7 benchmarks (BrowseComp, GPQA, Humanity's Last Exam, MMMLU, SWE-Bench Pro, SWE-Bench Verified, Terminal-Bench 2.0). Claude Mythos Preview significantly outperforms across most benchmarks.

On price, Gemini 3.1 Pro is roughly 8.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose Gemini 3.1 Pro if…

  • cost matters — it's about 8.9x cheaper per token

Choose Claude Mythos Preview if…

  • you want the strongest raw capability — it leads on 7 of 7 shared benchmarks
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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Gemini 3.1 Pro outperforms in 0 benchmarks, while Claude Mythos Preview is better at 7 benchmarks (BrowseComp, GPQA, Humanity's Last Exam, MMMLU, SWE-Bench Pro, SWE-Bench Verified, Terminal-Bench 2.0).

Claude Mythos Preview significantly outperforms across most benchmarks.

Sat Jun 06 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3.1 Pro costs less

For input processing, Gemini 3.1 Pro ($2.50/1M tokens) is 10.0x cheaper than Claude Mythos Preview ($25.00/1M tokens).

For output processing, Gemini 3.1 Pro ($15.00/1M tokens) is 8.3x cheaper than Claude Mythos Preview ($125.00/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Gemini 3.1 Pro.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sat Jun 06 2026 • llm-stats.com
Google
Gemini 3.1 Pro
Input tokens$2.50
Output tokens$15.00
Best providerGoogle
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
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Context Window

Maximum input and output token capacity

Only Gemini 3.1 Pro specifies input context (1,048,576 tokens). Only Gemini 3.1 Pro specifies output context (65,536 tokens).

Google
Gemini 3.1 Pro
Input1,048,576 tokens
Output65,536 tokens
Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.1 Pro and Claude Mythos Preview support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 3.1 Pro

Text
Images
Audio
Video

Claude Mythos Preview

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 3.1 Pro

Proprietary

Closed source

Claude Mythos Preview

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Pro was released on 2026-02-19, while Claude Mythos Preview's release date is not specified.

We can confirm Gemini 3.1 Pro's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Gemini 3.1 Pro

Feb 19, 2026

3 months ago

Claude Mythos Preview

—

Knowledge Cutoff

When training data ends

Gemini 3.1 Pro has a documented knowledge cutoff of 2025-01-31, while Claude Mythos Preview's cutoff date is not specified.

We can confirm Gemini 3.1 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Claude Mythos Preview's cutoff date.

Gemini 3.1 Pro

Jan 2025

Claude Mythos Preview

—

Provider Availability

Gemini 3.1 Pro is available from Google. Claude Mythos Preview is available from Anthropic.

Gemini 3.1 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

Claude Mythos Preview

anthropic logo
Anthropic
Input Price:Input: $25.00/1MOutput Price:Output: $125.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Anthropic
Higher BrowseComp score (86.9% vs 85.9%)
Higher GPQA score (94.6% vs 94.3%)
Higher Humanity's Last Exam score (64.7% vs 51.4%)
Higher MMMLU score (92.7% vs 92.6%)
Higher SWE-Bench Pro score (77.8% vs 54.2%)
Higher SWE-Bench Verified score (93.9% vs 80.6%)
Higher Terminal-Bench 2.0 score (82.0% vs 68.5%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3.1 Pro
Anthropic
Claude Mythos Preview

FAQ

Common questions about Gemini 3.1 Pro vs Claude Mythos Preview.

Which is better, Gemini 3.1 Pro or Claude Mythos Preview?

Claude Mythos Preview significantly outperforms across most benchmarks. Gemini 3.1 Pro is made by Google and Claude Mythos Preview is made by Anthropic. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3.1 Pro compare to Claude Mythos Preview in benchmarks?

Gemini 3.1 Pro scores t2-bench: 99.3%, LiveCodeBench Pro: 96.2%, GPQA: 94.3%, MMMLU: 92.6%, BrowseComp: 85.9%. Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%.

Is Gemini 3.1 Pro cheaper than Claude Mythos Preview?

Gemini 3.1 Pro is 10.0x cheaper for input tokens. Gemini 3.1 Pro costs $2.50/M input and $15.00/M output via google. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic.

What are the context window sizes for Gemini 3.1 Pro and Claude Mythos Preview?

Gemini 3.1 Pro supports 1.0M tokens and Claude Mythos Preview supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.1 Pro and Claude Mythos Preview?

Key differences include input pricing ($2.50 vs $25.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.1 Pro and Claude Mythos Preview?

Gemini 3.1 Pro is developed by Google and Claude Mythos Preview is developed by Anthropic.

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