Claude Fable 5 vs GPT-5.5
Anthropic against OpenAI, costed on the same three workloads. GPT-5.5 is cheaper on all three workloads.
Monthly bill, side by side
| Workload | Claude Fable 5 | GPT-5.5 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$40,275 | $22,163 | $18,113 (1.8×) |
| Document summariser 1,000 single-shot summaries a day |
$4,860 | $2,550 | $2,310 (1.9×) |
| Coding agent 200 twelve-turn sessions a day |
$28,080 | $14,940 | $13,140 (1.9×) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| Claude Fable 5 | GPT-5.5 | |
|---|---|---|
| Input, per 1M tokens | $10 | $5 |
| Output, per 1M tokens | $50 | $30 |
| Cached input | $1 | $0.5 |
| Context window | 1M | 1.05M |
| Maximum output | 128K | 128K |
| Reasoning model | yes | yes |
| Vision | yes | yes |
Run this comparison on your own numbers
Full detail: Claude Fable 5 pricing · GPT-5.5 pricing