Claude Fable 5.1 vs GPT-6 Luna Pro
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GPT-6 Luna Pro is 100.0× cheaper than Claude Fable 5.1 on a typical 3:1 input/output mix. GPT-6 Luna Pro has the larger context window (1.1M vs 1M).
| Claude Fable 5.1 | GPT-6 Luna Pro | |
|---|---|---|
| Input price / 1M | $10.00 | $0.10 |
| Output price / 1M | $50.00 | $0.50 |
| Blended price (3:1) | $20.00 | $0.20 |
| Cached input / 1M | $0.25 | $0.01 |
| Context window | 1M | 1.1M |
| Max output | 128K | 128K |
| Intelligence index | 53.4 | — |
| Coding index | 81.6 | — |
| Providers | 4 | 6 |
| Best provider uptime (30m) | 100.0% | 99.9% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-01 | 2026-09-22 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, Claude Fable 5.1 or GPT-6 Luna Pro?
GPT-6 Luna Pro is 100.0× cheaper than Claude Fable 5.1 on a typical 3:1 input/output mix.
Claude Fable 5.1 vs GPT-6 Luna Pro: which has a bigger context window?
Claude Fable 5.1: 1,000,000 tokens. GPT-6 Luna Pro: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Claude Fable 5.1 ≈ $45,000, GPT-6 Luna Pro ≈ $450.00.
More comparisons
Claude Fable 5.1 vs GLM 5.3 PrimeClaude Fable 5.1 vs Qwen3.8 Max PrimeClaude Fable 5.1 vs Command A+Claude Fable 5.1 vs GPT-6 LunaClaude Fable 5.1 vs GPT-6 Sol ProClaude Fable 5.1 vs GPT-6 SolClaude Fable 5.1 vs Claude Opus 5.5Claude Fable 5.1 vs MiMo-V2.6-Pro-UltraSpeedClaude Fable 5.1 vs MiMo-V2.6-FlashClaude Fable 5.1 vs Grok 4.7Claude Fable 5.1 vs Qwen3.8 Omni FlashClaude Fable 5.1 vs GLM 5.3 FlashXClaude Fable 5.1 vs DeepSeek V4.1 FlashClaude Fable 5.1 vs GPT-6 AstraClaude Fable 5.1 vs GPT-6 Astra ProClaude Fable 5.1 vs Qwen3.8 Max (0902)GPT-6 Luna Pro vs GLM 5.3 PrimeGPT-6 Luna Pro vs Qwen3.8 Max PrimeGPT-6 Luna Pro vs Command A+GPT-6 Luna Pro vs GPT-6 LunaGPT-6 Luna Pro vs GPT-6 Sol ProGPT-6 Luna Pro vs GPT-6 SolGPT-6 Luna Pro vs Claude Opus 5.5GPT-6 Luna Pro vs MiMo-V2.6-Pro-UltraSpeed