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Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.
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$0.20
Output$10.00
Context
Context length1,000,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput89 tok/s
Latency15.88s
GPT-5.6 Terra is the balanced, everyday tier of OpenAI's GPT-5.6 family, offering coding, reasoning, and agentic performance competitive with GPT-5.5 at roughly half the cost.
Document analysis#13Image understanding#34Mathematical#38Software & IT Services#42
AuthorOpenAI
Country🇺🇸 United States
ReleasedJul 9, 2026
Overview
Cost rate
2x
Context
1.1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$2.00
Cached input$0.20
Output$12.00
Context
Context length1,050,000
Max output tokens128,000
Knowledge cutoff2026-02-16
Performance
Throughput80 tok/s
Latency1.74s
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
57.6
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)56.0Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)53.4
