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Put models side by side on price, context, capabilities, and benchmarks.

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Claude Sonnet 5.5 is Anthropic's Sonnet-class model (1M-token context, 128K max output, $2/$10 per million input/output tokens), released September 28, 2026 as a direct upgrade to Sonnet 5 and a faster, lower-cost complement to Opus 5.5. It generates output over 30% faster with fewer tokens per task, and is strongest at well-scoped everyday work such as building features, fixing bugs, and producing polished documents, slides, and spreadsheets.

Mathematical#17Writing, Literature, & Language#27Entertainment, Sports, & Media#27Software & IT Services#33
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AuthorAnthropic
Country🇺🇸 United States
ReleasedSep 28, 2026
Overview
Cost rate
2x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$2.00
Cached input$0.10
Output$10.00
Context
Context length1,000,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput105 tok/s
Latency11.5s

GPT-6 Luna Pro is OpenAI's GPT-6 Luna served with reasoning mode set to "pro" for higher-quality answers on harder problems, keeping the same 1.05M-token context and $0.10/$0.50 per-million input/output pricing as the base model. It suits workloads that want Luna's low cost but need more careful reasoning than the default mode, at the expense of more tokens and latency per request.

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AuthorOpenAI
Country🇺🇸 United States
ReleasedSep 22, 2026
Overview
Cost rate
0.1x
Context
1.1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$0.10
Cached input$0.01
Output$0.50
Context
Context length1,050,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput-
Latency-

Benchmarks

Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.

Intelligence

59.1
Claude Opus 5.5 (Max, Default Fallback)
56.9
GPT-6 Astra (Max)
54.6
GPT-6.1 Sol (Max)
54.5
Claude Sonnet 5.5 (Max, Default Fallback)
51.3
GPT-6.1 Terra (Max)
50.4
Gemini 4 Argon (High)

GPT-6 Luna Pro has no data

Coding

80.7
Claude Fable 5.1
78.3
GPT-5.6 Sol
78.0
Claude Opus 5
76.9
GPT-6 Astra
76.7
GPT-5.6 Terra
76.5
Claude Fable 5

Claude Sonnet 5.5 has no data

GPT-6 Luna Pro has no data

Automation & Tool Use

57.2
Claude Fable 5.1
56.5
Claude Opus 5
56.0
Qwen3.8 Max (0902)
55.5
Muse Spark 1.3
53.1
GLM 5.3
52.5
Grok 4.6

Claude Sonnet 5.5 has no data

GPT-6 Luna Pro has no data

Intelligence, coding & agentic scores from Artificial Analysis.

Software & IT Services

arena.ai
1549
Gemini 4 Argon (High)
1542
Muse Wonder (Max)
1540
Claude Opus 4.7 (High)
1538
Claude Fable 5 (High)
1537
Claude Opus 4.6 (High)
1535
Claude Opus 5.5 (High)
1534
Muse Spark 1.2 (xHigh)
1532
GPT-6.1 Sol (Max)
1527
MiMo V2.6 Pro
1512
Claude Sonnet 5.5

GPT-6 Luna Pro has no data

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