Model Comparison

Claude Fable 5 vs Grok 4.5Which is better in 2026?

Claude Fable 5 significantly outperforms across most benchmarks. Grok 4.5 is 6.7x cheaper per token.

Verdict: Claude Fable 5 vs Grok 4.5 — which is better?

Claude Fable 5 (by Anthropic) and Grok 4.5 (by xAI) 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 3 benchmarks (GDPval-AA, SWE-Bench Pro, Terminal-Bench 2.1), while Grok 4.5 is better at 0 benchmarks. Claude Fable 5 significantly outperforms across most benchmarks.

On price, Grok 4.5 is roughly 6.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Fable 5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Fable 5 if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
  • you process long inputs — it offers a 1,000,000 token context window

Choose Grok 4.5 if…

  • cost matters — it's about 6.7x cheaper per token
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Claude Fable 5 outperforms in 3 benchmarks (GDPval-AA, SWE-Bench Pro, Terminal-Bench 2.1), while Grok 4.5 is better at 0 benchmarks.

Claude Fable 5 significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok 4.5 costs less

For input processing, Claude Fable 5 ($10.00/1M tokens) is 5.0x more expensive than Grok 4.5 ($2.00/1M tokens).

For output processing, Claude Fable 5 ($50.00/1M tokens) is 8.3x more expensive than Grok 4.5 ($6.00/1M tokens).

In conclusion, Claude Fable 5 is more expensive than Grok 4.5.*

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

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
Anthropic
Claude Fable 5
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
xAI
Grok 4.5
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Fable 5 accepts 1,000,000 input tokens compared to Grok 4.5's 500,000 tokens. Only Claude Fable 5 specifies output context (128,000 tokens).

Anthropic
Claude Fable 5
Input1,000,000 tokens
Output128,000 tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Fable 5 and Grok 4.5 support multimodal inputs.

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

Claude Fable 5

Text
Images
Audio
Video

Grok 4.5

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

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5 was released on 2026-06-09, while Grok 4.5 was released on 2026-07-08.

Grok 4.5 is 1 month newer than Claude Fable 5.

Claude Fable 5

Jun 9, 2026

1 months ago

Grok 4.5

Jul 8, 2026

1 weeks ago

4w 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. Grok 4.5 is available from xAI.

Claude Fable 5

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

Grok 4.5

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (1,000,000 tokens)
Higher GDPval-AA score (60.5% vs 51.4%)
Higher SWE-Bench Pro score (80.0% vs 64.7%)
Higher Terminal-Bench 2.1 score (84.3% vs 83.3%)
xAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Fable 5 and Grok 4.5 side-by-side, then vote on the output you prefer.

Claude Fable 5
✓ Preferred
Grok 4.5
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Fable 5
xAI
Grok 4.5

FAQ

Common questions about Claude Fable 5 vs Grok 4.5.

Which is better, Claude Fable 5 or Grok 4.5?

Claude Fable 5 significantly outperforms across most benchmarks. Claude Fable 5 is made by Anthropic and Grok 4.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Fable 5 compare to Grok 4.5 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%. Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%.

Is Claude Fable 5 cheaper than Grok 4.5?

Grok 4.5 is 5.0x cheaper for input tokens. Claude Fable 5 costs $10.00/M input and $50.00/M output via anthropic. Grok 4.5 costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for Claude Fable 5 and Grok 4.5?

Claude Fable 5 supports 1.0M tokens and Grok 4.5 supports 500K 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 Grok 4.5?

Key differences include context window (1.0M vs 500K), input pricing ($10.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5 and Grok 4.5?

Claude Fable 5 is developed by Anthropic and Grok 4.5 is developed by xAI.

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