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Claude Opus 5 vs GPT 5.6 Luna

Compare Claude Opus 5 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 Opus 5OpenAIGPT 5.6 Luna
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Anthropic logo
Claude Opus 5
Anthropic · text, image → text

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis of charts and documents, complex office deliverables, and coordinating parallel subagents. The model maintains strong instruction following and tool use across extended tasks, while remaining effective at lower effort settings for workloads that prioritize latency and token efficiency.

Input$5 /M
Output$25 /M
Cache read$0.5 /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 Opus 5
GPT 5.6 Luna
Input /M
$5
$0.2
Output /M
$25
$1.2
Cache read /M
$0.5
$0.02
Context length
1,000,000
1,050,000
Max output
128,000
128,000
Time to First Token
1.4 s
4.6 s
Throughput
62.2 tok/s
52.2 tok/s
Modalities
textimage
textimage
Supported Parameters
thinkingtoolsstructured outputslong contextweb
toolsthinkingstructured outputs
API Formats
chat_completions · claude_api · responses
chat_completions · responses
Released
July 24, 2026
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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-opus-5gpt-5.6-luna

Tokens / day

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Requests / day

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Performance Past 3 Days

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

claude-opus-5gpt-5.6-luna

Throughput (tok/s)

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TTFT (s)

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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 Opus 5
$675 /mo

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

FAQ

Which is cheaper: Claude Opus 5, GPT 5.6 Luna?

GPT 5.6 Luna: $1.2/M output tokens; Claude Opus 5: $25/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Claude Opus 5: 1.4s 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 Opus 5 accepts 1,000,000 and GPT 5.6 Luna accepts 1,050,000 input tokens. Maximum output per request is 128,000 tokens on Claude Opus 5 and 128,000 tokens on GPT 5.6 Luna.

Which one generates tokens faster?

Claude Opus 5 at 62.2 tok/s and GPT 5.6 Luna at 52.2 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 Opus 5 accepts text and image input and supports thinking, tool calling, structured outputs, long context and web search; GPT 5.6 Luna accepts text and image input and supports tool calling, thinking and structured outputs.

Can I call Claude Opus 5 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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