Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not exposed, reasoning cannot be disabled, and the reasoning ef…
Model details →xAI: Grok 4 vs Anthropic: Claude Fable Latest
xAI: Grok 4 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
This model always redirects to the latest model in the Claude Fable family.
Model details →Side-by-side comparison
| Capability | xAI: Grok 4 | Anthropic: Claude Fable Latest | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 256K | 1M | 🏆 Anthropic: Claude Fable Latest |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $10.00 | 🏆 xAI: Grok 4 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $50.00 | 🏆 xAI: Grok 4 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is xAI: Grok 4 better than Anthropic: Claude Fable Latest?
xAI: Grok 4 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between xAI: Grok 4 and Anthropic: Claude Fable Latest?
Input: $3.00 vs $10.00 per 1M tokens. Output: $15.00 vs $50.00 per 1M tokens.
What context windows do xAI: Grok 4 and Anthropic: Claude Fable Latest support?
xAI: Grok 4 supports up to 256K tokens. Anthropic: Claude Fable Latest supports up to 1M tokens.
Do both xAI: Grok 4 and Anthropic: Claude Fable Latest support tool calling?
xAI: Grok 4: yes. Anthropic: Claude Fable Latest: yes.
Compare xAI: Grok 4 with other models
vs Anthropic Claude Haiku Latestvs Anthropic Claude Sonnet Latestvs Anthropic: Claude Fable Latestvs Anthropic: Claude Opus Latest