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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#12Entertainment, Sports, & Media#15Writing, Literature, & Language#22Software & IT Services#24
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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
Throughput106 tok/s
Latency12.15s

This is OpenRouter's auto-updating alias to OpenAI's current 'Luna' model, always resolving to the newest release in that family (1.05M-token context) rather than a pinned snapshot. Luna is the cheapest and fastest tier in OpenAI's Sol/Terra/Luna/Astra alias family, priced roughly ten times below Sol and suited to high-volume, latency-sensitive chat and lightweight agent work.

Image understanding#66Mathematical#70Software & IT Services#72Entertainment, Sports, & Media#88
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AuthorOpenAI
Country🇺🇸 United States
ReleasedSep 11, 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

57.6
Claude Opus 5.5 (Max, Default Fallback)
56.0
Claude Sonnet 5.5 (Max, Default Fallback)
55.1
Kimi K3.1 Pro
53.4
Claude Fable 5.1 (Max, Default Fallback)
52.7
GPT-6 Astra (Max)
34.6
GPT Luna Latest

Coding

81.6
Claude Fable 5.1 (Max, Default Fallback)
78.3
GPT-5.6 Sol (Xhigh)
78.0
Claude Opus 5 (Max)
77.1
GPT-6 Astra (High)
76.8
Grok 4.6 (High)
76.7
GPT-5.6 Terra (Max)

Claude Sonnet 5.5 has no data

GPT Luna Latest has no data

Automation & Tool Use

57.9
Claude Fable 5.1 (Max, Default Fallback)
56.5
Claude Opus 5 (Max)
56.0
Qwen3.8 Max (0902)
55.5
Muse Spark 1.3 (Max)
53.1
GLM-5.3 (Max)
53.0
Grok 4.6 (High)

Claude Sonnet 5.5 has no data

GPT Luna Latest has no data

Intelligence, coding & agentic scores from Artificial Analysis.

Software & IT Services

arena.ai
1549
Gemini 4 Argon (High)
1540
Claude Opus 4.7 (High)
1538
Claude Fable 5 (High)
1538
Claude Opus 5.5 (High)
1537
Claude Opus 4.6 (High)
1534
Muse Wonder (Max)
1532
Muse Spark 1.2 (xHigh)
1530
Claude Fable 5.1 (Max)
1516
Claude Sonnet 5.5
1491
GPT Luna Latest

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