Claude Fable 5 vs GPT-5.6 Cyber
Both are Reasoning-tier models, from Anthropic and OpenAI respectively. Claude Fable 5 is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
- Input price: Claude Fable 5 is cheaper ($10.00 vs $12.50).
- Output price: Claude Fable 5 is cheaper ($50.00 vs $75.00).
- Blended, 4:1 input:output ratio: Claude Fable 5 is 28% cheaper ($18.00 vs $25.00 per weighted 1M tokens).
Side by side
| Spec | Claude Fable 5 | GPT-5.6 Cyber |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Tier | Reasoning | Reasoning |
| Context window | 1M | 400K |
| Max output | 128K | 128K |
| Input $/1M | $10.00 | $12.50 |
| Output $/1M | $50.00 | $75.00 |
| Cache read $/1M | $1.00 | $1.25 |
| Cache write $/1M | $12.50 | $15.63 |
| Modalities | text, image | text, image |
Claude Fable 5. 5-minute cache write shown; 1-hour cache write is $20/MTok.
GPT-5.6 Cyber. One flat rate, with no published long-context tier. Access is restricted to OpenAI's Daybreak program; also aliased as gpt-daybreak-red-latest.
Sources
Claude Fable 5 — verified August 29, 2026
GPT-5.6 Cyber — verified August 29, 2026
Full Claude Fable 5 pricing page → · Full GPT-5.6 Cyber pricing page →