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Claude Fable 5 vs Gemini 3.1 Pro

At a glance

Anthropic's Mythos-class flagship for ambitious, long-running professional work.

921M ctx$10.00/$50.00 per M#2/92

Google's frontier model with a large leap in core reasoning.

861.0M ctx$2.00/$12.00 per M#10/92
Agent Demos
All agent demos

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter6%
Capability
CapabilityECI6%91.6
Reasoning & Knowledge
Graduate Science—Expert-Level—Factual Recall68.3%
Math
Competition Math4%99.7%Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning—Task Horizon—
Reasoning
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Cheaper78%
Capability
CapabilityECI86.4
Reasoning & Knowledge
Graduate Science94.1%Expert-Level46.4%Factual Recall13%77.3%
Math
Competition Math95.6%Research Math36.9%
Coding
Real-World Coding80.6%
Agentic
Terminal Tasks80.2%Novel Reasoning77.1%Task Horizon6.4h
Specs
1M
Context
128K
Max output
Jun 2026
Released
1.0M
Context
66K
Max output
Feb 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$1.00/M tokens
Cache write$12.50/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input80%$2.00/M tokens
Output76%$12.00/M tokens
Reasoning$12.00/M tokens
Cache read80%$0.20/M tokens
Cache write97%$0.38/M tokens
Image input$2.00/M tokens
Audio input$2.00/M tokens
Web search$0.01/search
Chat with Claude Fable 5Go to model
Chat with Gemini 3.1 ProGo to model
Frequently Asked Questions: Claude Fable 5 vs Gemini 3.1 Pro▼

Which is better, Claude Fable 5 or Gemini 3.1 Pro?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 86.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Fable 5 or Gemini 3.1 Pro?

▼

Gemini 3.1 Pro has a lower blended cost. Claude Fable 5: $10.00 input / $50.00 output. Gemini 3.1 Pro: $2.00 input / $12.00 output.

Which has a larger context window, Claude Fable 5 or Gemini 3.1 Pro?

▼

Gemini 3.1 Pro has a larger context window: Claude Fable 5 supports 1M tokens vs Gemini 3.1 Pro at 1M tokens.

Do both Claude Fable 5 and Gemini 3.1 Pro support vision?

▼

Yes, both Claude Fable 5 and Gemini 3.1 Pro support vision/image input.

What are the key differences between Claude Fable 5 and Gemini 3.1 Pro?

▼

Key differences: Claude Fable 5 has a notably higher capability index (5.2 point gap); Gemini 3.1 Pro is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Claude Fable 5 and Gemini 3.1 Pro for free on idapt.app to see which performs better for your specific needs.

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