Claude Fable 5 vs Grok 4.3
How Claude Fable 5 (Anthropic) and Grok 4.3 (xAI) compare on price, context window and best-fit use case.
In short: Claude Fable 5 is best for the hardest multi-step agentic and coding work, frontier reasoning, and long-running autonomous tasks where capability matters most, while Grok 4.3 suits reasoning and agentic tasks needing current/real-time info and low output costs. On price it's $10.00 vs $1.25 ($0.20 cached) per 1M input tokens; on context, 1M tokens (128K max output) vs 1M tokens.
Verdict
Claude Fable 5 is the more capable pick (Bq score 98 vs 88). Choose Grok 4.3 if budget leads: its input price is $1.25 ($0.20 cached) per 1M vs $10.00.
| Spec | Claude Fable 5 | Grok 4.3 |
|---|---|---|
| Developer | Anthropic | xAI |
| Context window | 1M tokens (128K max output) | 1M tokens |
| Input price /1M | $10.00 | $1.25 ($0.20 cached) |
| Output price /1M | $50.00 | $2.50 |
| Modalities | text, image | text, image |
| Best for | The hardest multi-step agentic and coding work, frontier reasoning, and long-running autonomous tasks where capability matters most. | Reasoning and agentic tasks needing current/real-time info and low output costs. |
Claude Fable 5
- State-of-the-art reasoning and benchmarks
- Elite long-horizon agentic coding
- 1M context with adaptive thinking always on
- Scientific research and knowledge work
Grok 4.3
- Very competitive output pricing
- Configurable reasoning effort
- Real-time X and web search integration
- 1M context