Claude Fable 5 vs Grok 4
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Anthropic · Jun 2026
The first GA model of Anthropic's Mythos class — a tier above Opus — and the current SWE-bench Verified leader, at $10/$50 per 1M tokens.
xAI · Jul 2025
xAI's mid-2025 flagship, trained on the 200K-GPU Colossus cluster — a math and science reasoning standout of its generation.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: Grok 4 works out roughly 3.3x cheaper per blended million tokens. Claude Fable 5 also takes 1M of context versus 256K for Grok 4.
Specs & pricing
| Claude Fable 5 | Grok 4 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $10 | $3 |
| Output price / 1M | $50 | $15 |
| Context window | 1M | 256K |
| Max output | 128K | — |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image |
| Knowledge cutoff | Jan 2026 | Jul 2025 |
| Released | Jun 2026 | Jul 2025 |
| Example monthly cost* | $175.00 | $52.50 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Claude Fable 5 or Grok 4?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: Grok 4 works out roughly 3.3x cheaper per blended million tokens. Claude Fable 5 also takes 1M of context versus 256K for Grok 4.
- Which is cheaper, Claude Fable 5 or Grok 4?
- Claude Fable 5 costs $10/$50 per million input/output tokens, while Grok 4 costs $3/$15. For a typical workload of 10M input and 1.5M output tokens per month, that's $175.00 versus $52.50.
- Which model is better for coding, Claude Fable 5 or Grok 4?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.