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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

This is the batch-processing variant of GPT-6 Luna Pro, OpenAI's low-cost GPT-6 Luna served with reasoning mode "pro", offered at half the standard token price. Requests run asynchronously, best suited to large-scale jobs that benefit from deeper reasoning but do not need real-time responses.

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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$0.05
Cached input$0.01
Output$0.25
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 (batch) 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 (batch) 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 (batch) 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 (batch) has no data

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