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GPT 5 Pro vs GPT 5.6 Luna

Compare GPT 5 Pro from OpenAI and GPT 5.6 Luna from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

OpenAIGPT 5 ProOpenAIGPT 5.6 Luna
+ Add model · 2/4
OpenAI logo
GPT 5 Pro
OpenAI · text, image → text

GPT-5 pro uses more compute to think harder and provide consistently better answers. GPT-5 pro is available in the Responses API only to enable support for multi-turn model interactions before responding to API requests, and other advanced API features in the future. Since GPT-5 pro is designed to tackle tough problems, some requests may take several minutes to finish. To avoid timeouts, try using background mode. As our most advanced reasoning model, GPT-5 pro defaults to (and only supports) reasoning.effort: high. GPT-5 pro does not support code interpreter.

Input$15 /M
Output$120 /M
Details
OpenAI logo
GPT 5.6 Luna
OpenAI · text, image → text

GPT-5.6 Luna is designed for cost-sensitive, high-volume workloads. It roughly corresponds to the nano model tier used in earlier GPT-5 families.

Input$0.2 /M
Output$1.2 /M
Cache read$0.02 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

GPT 5 Pro
GPT 5.6 Luna
Input /M
$15
$0.2
Output /M
$120
$1.2
Cache read /M
-
$0.02
Context length
400,000
1,050,000
Max output
272,000
128,000
Time to First Token
313.1 s
5.1 s
Throughput
8.6 tok/s
47.6 tok/s
Modalities
textimage
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
toolsthinkingstructured outputs
API Formats
chat_completions · responses
Released
October 6, 2025
July 9, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

gpt-5-progpt-5.6-luna

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

gpt-5-progpt-5.6-luna

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

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Cost calculator

Estimate your monthly bill for the same workload on each model.

GPT 5.6 Luna
$30.00 /mo
GPT 5 Pro
$2,700 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: GPT 5 Pro, GPT 5.6 Luna?

GPT 5.6 Luna: $1.2/M output tokens; GPT 5 Pro: $120/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

GPT 5.6 Luna: 5.1s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

GPT 5 Pro accepts 400,000 and GPT 5.6 Luna accepts 1,050,000 input tokens. Maximum output per request is 272,000 tokens on GPT 5 Pro and 128,000 tokens on GPT 5.6 Luna.

Which one generates tokens faster?

GPT 5.6 Luna at 47.6 tok/s and GPT 5 Pro at 8.6 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

GPT 5 Pro accepts text and image input and supports thinking, tool calling, function calling and structured outputs; GPT 5.6 Luna accepts text and image input and supports tool calling, thinking and structured outputs.

Can I call GPT 5 Pro and GPT 5.6 Luna with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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