token.app › Compare › Claude Fable 5 vs Grok 4.5
Claude Fable 5 vs Grok 4.5
Claude Fable 5 leads on 4 of 5 shared benchmarks. Grok 4.5 is 6.7× cheaper per token on a blended 3:1 basis. Claude Fable 5 accepts the larger context window (1M).
Head to head
Blended price uses a 3:1 input:output mix
| Claude Fable 5 | Grok 4.5 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Input $/1M | $10.00 | $2.00 |
| Output $/1M | $50.00 | $6.00 |
| Blended $/1M | $20.00 | $3.00 |
| Context window | 1M | 500K |
| Max output | 128K | — |
| Released | Jun 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 85.9% | 93.4% |
| FrontierMath T1–3 | 87.0% | 57.2% |
| FrontierMath T4 | 87.8% | 24.4% |
| SimpleQA Verified | 68.3% | 53.5% |
| OTIS Mock AIME | 100.0% | 97.8% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Claude Fable 5 if…
- Higher FrontierMath T1–3 (87.0% vs 57.2%)
- Higher FrontierMath T4 (87.8% vs 24.4%)
- Higher SimpleQA Verified (68.3% vs 53.5%)
- Higher OTIS Mock AIME (100.0% vs 97.8%)
- Larger context window (1M)
Choose Grok 4.5 if…
- Costs less per token — $3.00 vs $20.00 blended
- Higher GPQA Diamond (93.4% vs 85.9%)
- Newer model (released Jul 2026)
FAQ
Which is better, Claude Fable 5 or Grok 4.5?
Across the 5 benchmarks both models have independently-run scores for, Claude Fable 5 leads on 4 and Grok 4.5 leads on 1. Benchmarks are one input — price and context window are on this page too.
Is Claude Fable 5 cheaper than Grok 4.5?
Grok 4.5 is cheaper: $3.00 versus $20.00 per million tokens blended at 3:1 input:output. Input alone: $10.00 vs $2.00. Output alone: $50.00 vs $6.00.
What context windows do Claude Fable 5 and Grok 4.5 have?
Claude Fable 5: 1,000,000 tokens. Grok 4.5: 500,000 tokens.
Who makes Claude Fable 5 and Grok 4.5?
Claude Fable 5 is made by Anthropic. Grok 4.5 is made by xAI.