Model Comparison

Claude Fable 5 vs Claude Opus 4.8Which is better in 2026?

Claude Fable 5 significantly outperforms across most benchmarks. Claude Opus 4.8 is 2.0x cheaper per token.

Verdict: Claude Fable 5 vs Claude Opus 4.8 — which is better?

Claude Fable 5 (by Anthropic) and Claude Opus 4.8 (by Anthropic) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Fable 5 outperforms in 9 benchmarks (Finance Agent v2, FrontierSWE, GDPval-AA, HealthBench Professional, Humanity's Last Exam, LiveBench, OSWorld-Verified, SWE-Bench Pro, SWE-Bench Verified), while Claude Opus 4.8 is better at 0 benchmarks. Claude Fable 5 significantly outperforms across most benchmarks.

On price, Claude Opus 4.8 is roughly 2.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose Claude Fable 5 if…

  • you want the strongest raw capability — it leads on 9 of 9 shared benchmarks
  • you want the most recent training data — it shipped Jun 2026

Choose Claude Opus 4.8 if…

  • cost matters — it's about 2.0x cheaper per token

Performance Benchmarks

Comparative analysis across standard metrics

9 benchmarks

Claude Fable 5 outperforms in 9 benchmarks (Finance Agent v2, FrontierSWE, GDPval-AA, HealthBench Professional, Humanity's Last Exam, LiveBench, OSWorld-Verified, SWE-Bench Pro, SWE-Bench Verified), while Claude Opus 4.8 is better at 0 benchmarks.

Claude Fable 5 significantly outperforms across most benchmarks.

Tue Jul 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Opus 4.8 costs less

For input processing, Claude Fable 5 ($10.00/1M tokens) is 2.0x more expensive than Claude Opus 4.8 ($5.00/1M tokens).

For output processing, Claude Fable 5 ($50.00/1M tokens) is 2.0x more expensive than Claude Opus 4.8 ($25.00/1M tokens).

In conclusion, Claude Fable 5 is more expensive than Claude Opus 4.8.*

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

Lowest available price from all providers
Tue Jul 14 2026 • llm-stats.com
Anthropic
Claude Fable 5
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
Anthropic
Claude Opus 4.8
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 4.8
Input1,000,000 tokens
Output128,000 tokens
Tue Jul 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Fable 5 and Claude Opus 4.8 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 4.8

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 4.8

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5 was released on 2026-06-09, while Claude Opus 4.8 was released on 2026-05-28.

Claude Fable 5 is 0 month newer than Claude Opus 4.8.

Claude Fable 5

Jun 9, 2026

1 months ago

1w newer
Claude Opus 4.8

May 28, 2026

1 months ago

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. Claude Opus 4.8 is available from Anthropic, Vertex AI.

Claude Fable 5

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

Claude Opus 4.8

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M
vertex logo
Unknown Organization
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→

Key Takeaways

Anthropic
Higher Finance Agent v2 score (56.3% vs 53.9%)
Higher FrontierSWE score (90.0% vs 75.0%)
Higher GDPval-AA score (60.5% vs 54.6%)
Higher HealthBench Professional score (66.0% vs 55.8%)
Higher Humanity's Last Exam score (64.5% vs 57.9%)
Higher LiveBench score (78.3% vs 77.2%)
Higher OSWorld-Verified score (85.0% vs 83.4%)
Higher SWE-Bench Pro score (80.0% vs 69.2%)
Higher SWE-Bench Verified score (95.0% vs 88.6%)
Anthropic
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Fable 5 and Claude Opus 4.8 side-by-side, then vote on the output you prefer.

Claude Fable 5
✓ Preferred
Claude Opus 4.8
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Fable 5
Anthropic
Claude Opus 4.8

FAQ

Common questions about Claude Fable 5 vs Claude Opus 4.8.

Which is better, Claude Fable 5 or Claude Opus 4.8?

Claude Fable 5 significantly outperforms across most benchmarks. Claude Fable 5 is made by Anthropic and Claude Opus 4.8 is made by Anthropic. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Fable 5 compare to Claude Opus 4.8 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 4.8 scores GPQA: 93.6%, DeepSearchQA: 93.1%, CharXiv-R: 89.9%, SWE-Bench Verified: 88.6%, ScreenSpot Pro: 87.9%.

Is Claude Fable 5 cheaper than Claude Opus 4.8?

Claude Opus 4.8 is 2.0x cheaper for input tokens. Claude Fable 5 costs $10.00/M input and $50.00/M output via anthropic. Claude Opus 4.8 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 4.8?

Claude Fable 5 supports 1.0M tokens and Claude Opus 4.8 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 4.8?

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

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