Claude Fable 5 vs Grok 4.3
Claude Fable 5 and Grok 4.3 are both current production-tier models. Grok 4.3 is meaningfully cheaper at $1.25 / $2.5 per 1M. Claude Fable 5 leads on coding, reasoning, general knowledge.
Specs side by side
| Metric | Anthropic Claude Fable 5 | xAI Grok 4.3 |
|---|---|---|
| Input price (per 1M) | $10 | $1.25 |
| Output price (per 1M) | $50 | $2.5 |
| Context window | 1M tokens | 1M tokens |
| Speed tier | slow | balanced |
| Open weights | No | No |
| EU region | Yes | No |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Claude Fable 5 if…
- EU data residency is required
- HIPAA eligibility is required
- Coding is central to your workload
- Reasoning is central to your workload
Choose Grok 4.3 if…
- Cost is a priority ($1.25 / $2.5 per 1M vs $10 / $50 per 1M)
Benchmark delta
Claude Fable 5 leads on
- Coding
- Reasoning
- General knowledge
- Long-context retrieval
- Instruction following
- Vision
- Tool use
Grok 4.3 leads on
Grok 4.3 has no meaningful benchmark lead in this pair.
FAQ — Claude Fable 5 vs Grok 4.3
Claude Fable 5 vs Grok 4.3 — which is better?
Claude Fable 5 and Grok 4.3 are both current production-tier models. Grok 4.3 is meaningfully cheaper at $1.25 / $2.5 per 1M. Claude Fable 5 leads on coding, reasoning, general knowledge. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Claude Fable 5 pricing compare to Grok 4.3?
Claude Fable 5 costs $10 / $50 per 1M vs Grok 4.3 at $1.25 / $2.5 per 1M. Grok 4.3 is cheaper on output tokens by roughly 1900%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Claude Fable 5 or Grok 4.3 have the bigger context window?
Grok 4.3 has a 1M-token context window — 1× the 1M context of Claude Fable 5. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Claude Fable 5 or Grok 4.3?
Claude Fable 5: no — No free API tier; available via Claude.ai paid plans. Grok 4.3: no — X Premium / SuperGrok includes Grok web chat; API is paid.
Which is better for coding — Claude Fable 5 or Grok 4.3?
Claude Fable 5 leads on coding benchmarks (Claude Fable 5: 98/100, Grok 4.3: 91/100). For production coding agents also weigh tool-use performance — Claude Fable 5 scores 97, Grok 4.3 scores 90.