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Claude Fable 5 vs Claude Opus 5

Claude Fable 5 and Claude Opus 5 are closely matched at 54.3 and 54.9 on the LLM Stats Score. Claude Opus 5 is 2.0x cheaper per token.

Anthropic · Anthropic · Updated for 2026

Which is better?

Claude Fable 5 and Claude Opus 5 are closely matched on the overall LLM Stats Score at 54.3 and 54.9.

In the 9 individual benchmarks reported for both models, Claude Opus 5 wins 5; this is a narrower head-to-head signal than the composite indexes.

On price, Claude Opus 5 is roughly 2.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Fable 5

  • you want predictable pricing at $10.00/M input and $50.00/M output

Choose Claude Opus 5

  • you value its reported benchmark strengths — it wins 5 of 9 exact shared results
  • cost matters — it's about 2.0x cheaper per token
  • you want the most recent training data — it shipped Jul 2026

At a glance

The differences that matter most.

Claude Fable 5
Anthropic
Claude Opus 5
Anthropic
Core performance indexes
LLM Stats Score
54.3
#7
54.9
#5
Reasoning
51.8
#9
53.9
#4
Coding
45.7
#3
41.9
#9
Agents
40.5
#5
40.0
#7
Cost, coverage & limits
Benchmark wins
4 of 9
5 of 9
Input price
$10.00 / M
$5.00 / M
Output price
$50.00 / M
$25.00 / M
Context window
1,000,000
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Fable 5
Claude Opus 5
Vision
36.2#9
37.9#4
Tool use
26.9#26
27.9#21
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

19 reported for Claude Fable 5 · 13 for Claude Opus 5

9 shared

Claude Fable 5 outperforms in 4 benchmarks (DeepSWE 1.1, FrontierCode 1.1, HealthBench Professional, Legal Agent Benchmark), while Claude Opus 5 is better at 5 benchmarks (AutomationBench, BioMysteryBench, FrontierCode, Humanity's Last Exam, Terminal-Bench 4.0).

Claude Opus 5 has a slight edge in benchmark performance.

Sat Sep 12 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Claude Opus 5 costs less

For input processing, Claude Fable 5 ($10.00/1M tokens) is 2.0x more expensive than Claude Opus 5 ($5.00/1M tokens).

For output processing, Claude Fable 5 ($50.00/1M tokens) is 2.0x more expensive than Claude Opus 5 ($25.00/1M tokens).

In conclusion, Claude Fable 5 is more expensive than Claude Opus 5.*

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

Lowest available price from all providers
Sat Sep 12 2026 • llm-stats.com
Anthropic
Claude Fable 5
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
Anthropic
Claude Opus 5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,000,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Fable 5
Input1,000,000 tokens
Output128,000 tokens
Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
Sat Sep 12 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5 and Claude Opus 5 support multimodal inputs.

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

Claude Fable 5

Text
Images
Audio
Video

Claude Opus 5

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.

Claude Fable 5

Proprietary

Closed source

Claude Opus 5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5 was released on 2026-06-09, while Claude Opus 5 was released on 2026-07-24.

Claude Opus 5 is 2 months newer than Claude Fable 5.

Claude Fable 5

Jun 9, 2026

3 months ago

Claude Opus 5

Jul 24, 2026

1 months ago

1mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Fable 5 is available from Anthropic, DeepInfra. Claude Opus 5 is available from Anthropic, DeepInfra.

Claude Fable 5

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M
deepinfra logo
Deepinfra
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

Claude Opus 5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M
deepinfra logo
Deepinfra
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5 and Claude Opus 5 side-by-side, then vote on the output you prefer.

Claude Fable 5
✓ Preferred
Claude Opus 5
Open in Playground

FAQ

Common questions about Claude Fable 5 vs Claude Opus 5.

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

Claude Fable 5 and Claude Opus 5 are closely matched on the LLM Stats Score at 54.3 and 54.9. Claude Fable 5 is made by Anthropic and Claude Opus 5 is made by Anthropic. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Fable 5 compare to Claude Opus 5 in benchmarks?

Claude Fable 5 scores SWE-Bench Verified: 95.0%, FrontierSWE: 90.0%, OSWorld-Verified: 85.0%, Terminal-Bench 2.1: 84.3%, SWE-Bench Pro: 80.0%. Claude Opus 5 scores BrowseComp: 90.8%, BioMysteryBench: 90.1%, OSWorld 2.0: 70.6%, DeepSWE 1.1: 68.8%, Humanity's Last Exam: 64.7%.

Is Claude Fable 5 cheaper than Claude Opus 5?

Claude Opus 5 is 2.0x cheaper for input tokens. Claude Fable 5 costs $10.00/M input and $50.00/M output via anthropic. Claude Opus 5 costs $5.00/M input and $25.00/M output via anthropic.

What are the context window sizes for Claude Fable 5 and Claude Opus 5?

Claude Fable 5 supports 1.0M tokens and Claude Opus 5 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Fable 5 and Claude Opus 5?

Key differences include LLM Stats Score (54.3 vs 54.9), input pricing ($10.00 vs $5.00/M). See the full comparison above for benchmark-by-benchmark results.

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