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Claude Opus 4.5 vs Claude Fable 5

At a glance

Anthropic's frontier reasoning model for complex software engineering and agentic workflows.

81200K ctx$5.00/$25.00 per M#22/92

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
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper50%
Capability
CapabilityECI81.4
Reasoning & Knowledge
Graduate Science80.7%Factual Recall—
Math
Competition Math48.1%Research Math20.7%
Coding
Real-World Coding76.7%
Agentic
Terminal Tasks63.1%Novel Reasoning7.8%Task Horizon4.9h
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter13%
Capability
CapabilityECI13%91.6
Reasoning & Knowledge
Graduate Science—Factual Recall68.3%
Math
Competition Math108%99.7%Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning—Task Horizon—
Specs
200K
Context
64K
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
Input50%$5.00/M tokens
Output50%$25.00/M tokens
Cache read50%$0.50/M tokens
Cache write50%$6.25/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 Claude Opus 4.5Go to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: Claude Opus 4.5 vs Claude Fable 5▼

Which is better, Claude Opus 4.5 or Claude Fable 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 81.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Opus 4.5 or Claude Fable 5?

▼

Claude Opus 4.5 has a lower blended cost. Claude Opus 4.5: $5.00 input / $25.00 output. Claude Fable 5: $10.00 input / $50.00 output.

Which has a larger context window, Claude Opus 4.5 or Claude Fable 5?

▼

Claude Fable 5 has a larger context window: Claude Opus 4.5 supports 200K tokens vs Claude Fable 5 at 1M tokens.

Do both Claude Opus 4.5 and Claude Fable 5 support vision?

▼

Yes, both Claude Opus 4.5 and Claude Fable 5 support vision/image input.

What are the key differences between Claude Opus 4.5 and Claude Fable 5?

▼

Key differences: Claude Fable 5 has a notably higher capability index (10.2 point gap). 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 Opus 4.5 and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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