Claude Fable 5 vs GPT-5.4
Claude Fable 5 and GPT-5.4 are both current production-tier models. GPT-5.4 is meaningfully cheaper at $2.5 / $15 per 1M. Claude Fable 5 has a 1M context window — about 3× the 400k of GPT-5.4. Claude Fable 5 leads on coding, reasoning, long-context retrieval.
Specs side by side
| Metric | Anthropic Claude Fable 5 | OpenAI GPT-5.4 |
|---|---|---|
| Input price (per 1M) | $10 | $2.5 |
| Output price (per 1M) | $50 | $15 |
| Context window | 1M tokens | 400k tokens |
| Speed tier | slow | balanced |
| Open weights | No | No |
| EU region | Yes | Yes |
| 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…
- You need 1M context (3× more than GPT-5.4)
- Coding is central to your workload
- Reasoning is central to your workload
Choose GPT-5.4 if…
- Cost is a priority ($2.5 / $15 per 1M vs $10 / $50 per 1M)
Benchmark delta
Claude Fable 5 leads on
- Coding
- Reasoning
- Long-context retrieval
- Tool use
GPT-5.4 leads on
GPT-5.4 has no meaningful benchmark lead in this pair.
FAQ — Claude Fable 5 vs GPT-5.4
Claude Fable 5 vs GPT-5.4 — which is better?
Claude Fable 5 and GPT-5.4 are both current production-tier models. GPT-5.4 is meaningfully cheaper at $2.5 / $15 per 1M. Claude Fable 5 has a 1M context window — about 3× the 400k of GPT-5.4. Claude Fable 5 leads on coding, reasoning, long-context retrieval. 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 GPT-5.4?
Claude Fable 5 costs $10 / $50 per 1M vs GPT-5.4 at $2.5 / $15 per 1M. GPT-5.4 is cheaper on output tokens by roughly 233%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Claude Fable 5 or GPT-5.4 have the bigger context window?
Claude Fable 5 has a 1M-token context window — 3× the 400k context of GPT-5.4. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Claude Fable 5 or GPT-5.4?
Claude Fable 5: no — No free API tier; available via Claude.ai paid plans. GPT-5.4: no — Free $5 credit for new accounts; paid thereafter.
Which is better for coding — Claude Fable 5 or GPT-5.4?
Claude Fable 5 leads on coding benchmarks (Claude Fable 5: 98/100, GPT-5.4: 93/100). For production coding agents also weigh tool-use performance — Claude Fable 5 scores 97, GPT-5.4 scores 93.