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Claude 3.5 Sonnet vs GPT 5.6 Luna

Compare Claude 3.5 Sonnet from Anthropic 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.

AnthropicClaude 3.5 SonnetOpenAIGPT 5.6 Luna
+ Add model · 2/4
Anthropic logo
Claude 3.5 Sonnet
Anthropic · text, image → text

Claude 3.5 Sonnet delivers performance superior to Opus and speeds faster than its predecessor, all at the same price point. Its core strengths include: Coding: Autonomously writes, edits, and executes code with advanced reasoning and troubleshooting. Data Science: Augments human expertise by analyzing unstructured data and using multiple tools to generate insights. Visual Processing: Excels at interpreting charts, graphs, and images, accurately transcribing text to derive high-level insights. Agentic Tasks: Exceptional tool use makes it highly effective for complex, multi-step agentic workflows that interact with other systems.

Input$3.3 /M
Output$16.5 /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.

Claude 3.5 Sonnet
GPT 5.6 Luna
Input /M
$3.3
$0.2
Output /M
$16.5
$1.2
Cache read /M
-
$0.02
Context length
200,000
1,050,000
Max output
8,192
128,000
Time to First Token
0.6 s
5.0 s
Throughput
57.2 tok/s
47.6 tok/s
Modalities
textimage
textimage
Supported Parameters
toolsfunction callingstructured outputs
toolsthinkingstructured outputs
API Formats
chat_completions · responses
Released
-
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.

claude-3-5-sonnetgpt-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.

claude-3-5-sonnetgpt-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
Claude 3.5 Sonnet
$446 /mo

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

FAQ

Which is cheaper: Claude 3.5 Sonnet, GPT 5.6 Luna?

GPT 5.6 Luna: $1.2/M output tokens; Claude 3.5 Sonnet: $16.5/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Claude 3.5 Sonnet: 0.6s 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?

Claude 3.5 Sonnet accepts 200,000 and GPT 5.6 Luna accepts 1,050,000 input tokens. Maximum output per request is 8,192 tokens on Claude 3.5 Sonnet and 128,000 tokens on GPT 5.6 Luna.

Which one generates tokens faster?

Claude 3.5 Sonnet at 57.2 tok/s and GPT 5.6 Luna at 47.6 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Claude 3.5 Sonnet accepts text and image input and supports 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 Claude 3.5 Sonnet 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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