Rate
Claude Fable 5.1 vs GPT-5.6 Luna: price
GPT-5.6 Luna is 44.4× cheaper than Claude Fable 5.1 for a typical chat workload (1,500 tokens in, 500 out).
| Item | Claude Fable 5.1 | GPT-5.6 Luna |
|---|---|---|
| Input per 1M tokens | $10.00 | $0.20 |
| Output per 1M tokens | $50.00 | $1.20 |
| Cached input per 1M | $0.25 | $0.02 |
| 1,000 chat messages1,500 tokens in, 500 out each | $40.00 | $0.90 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.35 | $0.0072 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.80 | $0.017 |
List prices checked September 28, 2026. Price is half the story: see how people rate each one today.
Claude Fable 5.1 vs GPT-5.6 Luna in numbers
Output, usually the bigger part of the bill, costs $50.00 on Claude Fable 5.1 and $1.20 on GPT-5.6 Luna, so GPT-5.6 Luna is 41.7× cheaper there. Input costs $10.00 versus $0.20 per million tokens. For a coding-agent task (60,000 tokens in, 4,000 out) that is $0.80 on Claude Fable 5.1 and $0.017 on GPT-5.6 Luna. Claude Fable 5.1 accepts 1M tokens of context and GPT-5.6 Luna 1.05M tokens. Claude Fable 5.1 came out on September 1, 2026 and GPT-5.6 Luna on July 9, 2026.
Claude Fable 5.1 is made by Anthropic; GPT-5.6 Luna by OpenAI. Estimate your own bill for both in the cost calculator.
Which one feels dumber today?
- Claude Fable 5.1Anthropic
–no votes yet - GPT-5.6 LunaOpenAI–no votes yet
Frequently asked questions
Is Claude Fable 5.1 or GPT-5.6 Luna cheaper?
GPT-5.6 Luna is 44.4× cheaper than Claude Fable 5.1 for a typical chat workload (1,500 tokens in, 500 out). Output, usually the bigger part of the bill, costs $50.00 on Claude Fable 5.1 and $1.20 on GPT-5.6 Luna, so GPT-5.6 Luna is 41.7× cheaper there.
Which is better, Claude Fable 5.1 or GPT-5.6 Luna?
It depends on the task, and price is only part of it. Check how people rate each one today on the Claude Fable 5.1 and GPT-5.6 Luna pages, and read what users report in Discussions.