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GPT Mini (120b) vs Claude Fable 5

At a glance

OpenAI's budget-friendly reasoning model — fast and surprisingly capable.

73131K ctx$0.04/$0.17 per M#49/92

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 ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper100%
Capability
CapabilityECI73.2
Reasoning & Knowledge
Factual Recall—
Math
Competition Math—
Coding
Code Editing41.8%
Agentic
Terminal Tasks18.7%Task Horizon42min
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter25%
Capability
CapabilityECI25%91.6
Reasoning & Knowledge
Factual Recall68.3%
Math
Competition Math99.7%
Coding
Code Editing—
Agentic
Terminal Tasks—Task Horizon—
Specs
131K
Context
66K
Max output
Aug 2025
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input100%$0.04/M tokens
Output100%$0.17/M tokens
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 Mini (120b)Go to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: GPT Mini (120b) vs Claude Fable 5▼

Which is better, GPT Mini (120b) or Claude Fable 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 73.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT Mini (120b) or Claude Fable 5?

▼

GPT Mini (120b) has a lower blended cost. GPT Mini (120b): $0.04 input / $0.17 output. Claude Fable 5: $10.00 input / $50.00 output.

Which has a larger context window, GPT Mini (120b) or Claude Fable 5?

▼

Claude Fable 5 has a larger context window: GPT Mini (120b) supports 131K tokens vs Claude Fable 5 at 1M tokens.

Do both GPT Mini (120b) and Claude Fable 5 support vision?

▼

Claude Fable 5 supports vision/image input, but GPT Mini (120b) does not.

What are the key differences between GPT Mini (120b) and Claude Fable 5?

▼

Key differences: Claude Fable 5 has a notably higher capability index (18.4 point gap); GPT Mini (120b) is significantly cheaper; only Claude Fable 5 supports vision input. 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 Mini (120b) and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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