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GPT 5.1 Codex Mini vs Claude Fable 5

At a glance

Compact coding model for fast, cost-efficient development tasks.

400K ctx$0.25/$2.00 per M

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

921M ctx$10.00/$50.00 per M#2/92
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Cheaper97%
Capability
Capability—
Reasoning & Knowledge
Factual Recall—
Math
Competition Math—
Agentic
Terminal Tasks61.6%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI91.6
Reasoning & Knowledge
Factual Recall68.3%
Math
Competition Math99.7%
Agentic
Terminal Tasks—
Specs
400K
Context
100K
Max output
Nov 2025
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input98%$0.25/M tokens
Output96%$2.00/M tokens
Cache read98%$0.02/M tokens
Web search$0.01/search
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 search$0.01/search
Chat with GPT 5.1 Codex MiniGo to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: GPT 5.1 Codex Mini vs Claude Fable 5▼

Which is better, GPT 5.1 Codex Mini or Claude Fable 5?

▼

Both GPT 5.1 Codex Mini and Claude Fable 5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.1 Codex Mini or Claude Fable 5?

▼

GPT 5.1 Codex Mini has a lower blended cost. GPT 5.1 Codex Mini: $0.25 input / $2.00 output. Claude Fable 5: $10.00 input / $50.00 output.

Which has a larger context window, GPT 5.1 Codex Mini or Claude Fable 5?

▼

Claude Fable 5 has a larger context window: GPT 5.1 Codex Mini supports 400K tokens vs Claude Fable 5 at 1M tokens.

Do both GPT 5.1 Codex Mini and Claude Fable 5 support vision?

▼

Yes, both GPT 5.1 Codex Mini and Claude Fable 5 support vision/image input.

What are the key differences between GPT 5.1 Codex Mini and Claude Fable 5?

▼

Key differences: GPT 5.1 Codex Mini 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 GPT 5.1 Codex Mini and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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