Claude Haiku 5.5 vs Grok 4 Fast
Both have similar output pricing, while Grok 4 Fast offers a larger context window. Choose Claude Haiku 5.5 or Grok 4 Fast based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Haiku 5.5 | Grok 4 Fast |
|---|---|---|
| Provider | Anthropic | ZenMux |
| Input / 1M tokens | $0.10 | $0.20 |
| Output / 1M tokens | $0.50 | $0.50 |
| Context window | 1M | 2M |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Sep 2025 |
| GPQA Diamond score | 89.7 | — |
| Epoch Capabilities Index score | 159 | 144 |
| LMArena WebDev Elo score | 1585 | 1159 |
| LMArena (Chatbot Arena) Elo score | — | 1400 |
FAQ
Is Claude Haiku 5.5 or Grok 4 Fast cheaper?
Claude Haiku 5.5 and Grok 4 Fast have comparable output pricing.
Which has the larger context window, Claude Haiku 5.5 or Grok 4 Fast?
Grok 4 Fast has the larger context window (2M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.