Claude 3.7 Sonnet
Claude 3.7 Sonnet is Anthropic's hybrid reasoning model released February 24, 2025. Combines standard mode with extended thinking mode and configurable thinking token budget. Retired from Anthropic API on October 28, 2025.
Technical specification
Modalities
Capabilities
12Reasoning★
Reasoning
Multi-step reasoning★
Reasoning
Long context★
Reasoning
Coding★
Coding
Function Calling
Planning
Structured output★
Structured gen.
Image understanding★
Vision
Chart understanding
Vision
OCR★
Vision
Multilingual★
Language
Planning★
Planning
Streaming output
Reasoning
Architecture and technologies
Core Architecture
1Form / Family
2Training Techniques
3Applications
$3.00/MTok input, $15.00/MTok output (thinking tokens counted as output). Batch API: 50% discount ($1.50/$7.50). Prompt caching: cache write ×1.25 base input, cache read ×0.10 base input. Model deprecated from API on 28.10.2025.
INPUT
$3.0000 / per 1M tokens
OUTPUT
$15.0000 / per 1M tokens
CACHE
$0.3000 / per 1M tokens
TOTAL
for 10K tokens
Output includes thinking tokens. Cache write (5 min): $3.75/MTok. Cache read: $0.30/MTok.
Batch API – 50% discount. Asynchronous processing (results within 24h).
Security and enterprise
Model evaluated under ASL-2 (Anthropic Responsible Scaling Policy). The system card covers CBRN, cybersecurity, autonomy, extended thinking faithfulness, and computer use evaluations. Unnecessary refusals reduced by 45% relative to Claude 3.5 Sonnet.
Technical information
1) ASL-2 classification assigned following an iterative evaluation process (6 model snapshots, FRT + AST assessments). 2) Unnecessary refusals reduced by 45% (standard mode) and 31% (extended thinking mode) vs. Claude 3.5 Sonnet. 3) Extended thinking chains of thought do not fully reflect the actual reasoning process — disclosed by Anthropic in the system card. 4) Computer use evaluation included analysis of prompt injection attacks. 5) Model retired from the Anthropic API on 28.10.2025. Deprecated on Vertex AI from 11.11.2025 (shutdown 11.05.2026 for existing customers). Researcher access available via the External Researcher Access Program.