Anthropic · Frontier
Claude Sonnet Latest
Compatibility alias that routes to the newest version of Claude Sonnet. Currently routes to Claude Sonnet 5.5 Thinking.
- Reasoning
- Tools
- Vision
- Structured output
- PDF input
- Input
- Text, Images
- Output
- Text
- Reasoning effort
- low · medium · high · xhigh · max
- Discovery tier
- Frontier
Pricing
USD per 1M tokens- Input
- $2.00
- Output
- $10.00
- Cache read
- $0.10
- Cache write
- $2.50
- $4.00 for a 1-hour cache
Reference prices as published by the model provider. API example
Specifications
- Context window
- 1M
- Max output
- 128K
- Average output (7 days)
- 1K tokens
- Longer than 71% of 473 models
Side by side
Compare models
Put Claude Sonnet Latest next to up to three other models. The comparison stays in the link, so you can share it.
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
Intelligence Index
46.8
Tested at high reasoning effort
Better than 93% of 326 scored models
Agentic work
AutomationBench-AA
59.4%Workflow automation, penalized for guardrail violations
Better than 79% of 173 scored models
AutomationBench-AA tasks completed
29.4%Workflows finished end to end without a guardrail violation
Better than 80% of 173 scored models
AA-Briefcasev1.1
1,635 EloAgentic knowledge work, rated head to head
Better than 93% of 166 scored models
GDPval-AAv2.1
1,548 EloEconomically valuable occupational tasks, rated head to head
Better than 81% of 187 scored models
Document reasoning
GDP.pdf
25.2%Professional reasoning over PDF documents, all-pass rate
Better than 88% of 171 scored models
AA-LCRv1.1
78.0%Reasoning across long documents
Better than 65% of 309 scored models
MLCR-AA
18.9%Long-context reasoning over medical records
Better than 76% of 121 scored models
Reasoning and knowledge
Humanity’s Last Exam
45.8%Expert-level questions across academic fields
Better than 88% of 323 scored models
Coding
Terminal-Benchv4.0
43.9%Practical software engineering in a terminal
Better than 90% of 171 scored models
SciCode
53.7%Scientific computing in Python
Better than 66% of 174 scored models
Legacy evaluations
AA-LCR (unversioned)
78.0%Long-context reasoning, earlier grading
Better than 65% of 309 scored models
Scores from Artificial Analysis, updated Oct 26, 2026. Claude Sonnet Latest was tested at high reasoning effort; compare scores measured at the same effort.Artificial Analysis
Live routing data
Performance and reliability
Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.
- Throughput
- 238.5 tok/s
- Faster than 87% of 260 models
- Time to first token
- 5.4 s
- Quicker than 27% of 260 models
- Prompt cache hits
- 0.0%
- About $2.00 per 1M input tokens with caching
- Request success (24h)
- 99.3%
- Reliable
Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.
- Healthy (98% or more)
- Degraded (90–98%)
- Down (under 90%)
- No requests
Developers
Use it through the API
Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.
curl https://www.noumen.xyz/api/v1/chat/completions \
-H "Authorization: Bearer $NOUMEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic/claude-sonnet-latest",
"reasoning_effort": "medium",
"messages": [{ "role": "user", "content": "Explain this stack trace." }]
}'import os
from openai import OpenAI
client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
model="anthropic/claude-sonnet-latest",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)Anthropic
Related models
Other Anthropic models, starting with the same family.