Adds extended, step‑by‑step reasoning for tougher coding, planning, and multi‑tool tasks. Ideal for long‑horizon agent workflows, complex problem solving, and scenarios that benefit from explicit thinking traces.
Added Sep 29, 2025
Context Window
1.0M
Max Output
64.0K
Avg output tokens (7d)
1.7K tokens
Input Price (Auto)
$3.00/1M
Output Price (Auto)
$15.00/1M
Cache Read (Auto)
$0.30/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
37.4
Coding Index
52.1
Agentic Index
26.4
Reasoning
GPQA Diamond
Graduate-level scientific reasoning
83.4%
Better than 76% of models compared
HLE
Humanity's Last Exam
17.8%
Better than 72% of models compared
IFBench
Instruction-following benchmark
57.3%
Better than 68% of models compared
T²-Bench Telecom
Conversational AI agents in dual-control scenarios
78.1%
Better than 68% of models compared
AA-LCR
Long context reasoning evaluation
68.3%
Better than 76% of models compared
Coding
SciCode
Python programming for scientific computing
44.7%
Better than 83% of models compared
Terminal-Bench Hard
Agentic coding and terminal use
35.6%
Better than 82% of models compared
LiveCodeBench
Contamination-free coding benchmark
71.4%
Better than 82% of models compared
Math
AIME 2025
American Invitational Mathematics Examination 2025
88.0%
Better than 86% of models compared
Knowledge
MMLU-Pro
Professional and academic subject knowledge
87.5%
Better than 98% of models compared
Last updated Aug 16, 2026
Artificial AnalysisProviders
Auto routing is available for this model. Explicit provider selection is not available.
Loading provider options…
Related text models
Compare Claude Sonnet 4.5 Thinking with similar models from the same provider or model family.
Claude Sonnet 4.5
claude-sonnet-4-5-20250929Frontier‑level coding and agentic performance. Claude Sonnet 4.5 leads on real‑world coding tasks and shows substantial gains in computer use, reasoning, and math. Designed for long‑horizon, multi‑step work across IDE + terminal workflows, large codebases, and complex agents — a drop‑in upgrade over previous Sonnet versions.
Claude Sonnet 5
anthropic/claude-sonnet-5Claude Sonnet 5 via Anthropic's native API.
Claude Sonnet 5 Thinking
anthropic/claude-sonnet-5:thinkingClaude Sonnet 5 with adaptive thinking enabled for complex coding, planning, and agentic work.
Claude Sonnet Latest
anthropic/claude-sonnet-latestCompatibility alias that routes to the newest version of Claude Sonnet. Currently routes to Claude Sonnet 5 Thinking.
Claude Sonnet 4.6
anthropic/claude-sonnet-4.6Claude Sonnet 4.6 is Anthropic's most capable Sonnet yet — a full upgrade across coding, computer use, long-context reasoning, agent planning, and design. Supports up to a 1M-token context window at Sonnet pricing.
Claude Sonnet 4.6 Thinking
anthropic/claude-sonnet-4.6:thinkingClaude Sonnet 4.6 with extended thinking enabled for tougher coding, planning, and multi‑tool tasks. Ideal for long‑horizon agent workflows and complex problem solving.