Claude Fable 5 vs Grok 4.1 Fast
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 · Nov 2025
A 2M-token context window for $0.20 per million input tokens — the cheapest long-context frontier offering anywhere.
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 4.1 Fast works out roughly 73x cheaper per blended million tokens. Grok 4.1 Fast also takes 2M of context versus 1M for Claude Fable 5.
Specs & pricing
| Claude Fable 5 | Grok 4.1 Fast | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $10 | $0.2 |
| Output price / 1M | $50 | $0.5 |
| Context window | 1M | 2M |
| Max output | 128K | — |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image |
| Knowledge cutoff | Jan 2026 | Nov 2025 |
| Released | Jun 2026 | Nov 2025 |
| Example monthly cost* | $175.00 | $2.75 |
* 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 4.1 Fast?
- 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 4.1 Fast works out roughly 73x cheaper per blended million tokens. Grok 4.1 Fast also takes 2M of context versus 1M for Claude Fable 5.
- Which is cheaper, Claude Fable 5 or Grok 4.1 Fast?
- Claude Fable 5 costs $10/$50 per million input/output tokens, while Grok 4.1 Fast costs $0.2/$0.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $175.00 versus $2.75.
- Which model is better for coding, Claude Fable 5 or Grok 4.1 Fast?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.