Claude Fable 5 vs GPT-5.5 Pro: which API costs less?
Averaged across three realistic workloads, Claude Fable 5 is about 84% cheaper than GPT-5.5 Pro. Below: raw rates and side-by-side monthly costs, computed from prices verified 2026-07-05 (we track what you are billed today, promos included).
Rates per 1M tokens
| Model | Input | Output | Cached input |
|---|---|---|---|
| Claude Fable 5Anthropic | $10 | $50 | $1 |
| GPT-5.5 ProOpenAI | $30 | $180 | — |
Claude Fable 5: Najbardziej zaawansowany model.
Monthly cost, side by side
| Workload | Claude Fable 5 | GPT-5.5 Pro | Difference |
|---|---|---|---|
Customer-support chatbot 2M input + 0.5M output tokens/month, 60% of input served from prompt cache | $34.20 | $150 | Claude Fable 5 −77% |
RAG / document Q&A 20M input + 1M output tokens/month, 70% cached (shared context) | $124 | $780 | Claude Fable 5 −84% |
Agentic coding assistant 50M input + 5M output tokens/month, 80% cached (long sessions) | $390 | $2400 | Claude Fable 5 −84% |
Your traffic looks different? Run your own numbers in the calculator.
FAQ
Which is cheaper: Claude Fable 5 or GPT-5.5 Pro?
Across three realistic workloads (chatbot, RAG, agent), Claude Fable 5 works out about 84% cheaper than GPT-5.5 Pro on average. Raw rates: Claude Fable 5 $10/$50 per 1M tokens vs GPT-5.5 Pro $30/$180. Verified 2026-07-05.
Does prompt caching change the comparison?
Yes — cached input costs $1 on Claude Fable 5 and the full input rate on GPT-5.5 Pro (no cache discount listed). Our scenario numbers already include realistic cache hit rates.
Is cheaper always better?
No. Price is one axis — model capability, context window and latency differ. This page answers only the cost question; benchmark quality on your own tasks before switching.