Claude Fable 5 vs GPT-5.6 Luna Pro

Price, context window & benchmark comparison

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Claude Fable 5

Anthropic
$10.00 / $50.00
Input / Output · per 1M tokens
VS
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GPT-5.6 Luna Pro

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna Pro is 44.4× cheaper than Claude Fable 5 on a typical 3:1 input/output mix. GPT-5.6 Luna Pro has the larger context window (1.1M vs 1M).
Claude Fable 5GPT-5.6 Luna Pro
Input price / 1M$10.00$0.20
Output price / 1M$50.00$1.20
Blended price (3:1)$20.00$0.45
Cached input / 1M$1.00$0.02
Context window1M1.1M
Max output128K128K
Intelligence index49.6—
Coding index76.5—
Providers65
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-06-092026-07-09
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Fable 5 or GPT-5.6 Luna Pro?

GPT-5.6 Luna Pro is 44.4× cheaper than Claude Fable 5 on a typical 3:1 input/output mix.

Claude Fable 5 vs GPT-5.6 Luna Pro: which has a bigger context window?

Claude Fable 5: 1,000,000 tokens. GPT-5.6 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 ≈ $45,000, GPT-5.6 Luna Pro ≈ $1,000.

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