Anthropic · Frontier
Claude Sonnet 5 Thinking
Claude Sonnet 5 with adaptive thinking enabled for complex coding, planning, and agentic work.
- 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
- $0.20
- 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)
- 2.6K tokens
- Longer than 95% of 473 models
Side by side
Claude Sonnet 5 Thinking compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| Claude Sonnet 5 ThinkingAnthropicThis model | Claude Sonnet 4.6 ThinkingAnthropicRemove | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Discovery tier | Frontier | Frontier |
| Added | Jun 30, 2026 | Feb 17, 2026 |
| Limits | ||
| Context window | 1M | 1M |
| Max output | 128K | 128K |
| Average output | 2.6K tokens | 598 tokens |
| Pricing, USD per 1M tokens | ||
| Input | $2.00Best | $3.00 |
| Output | $10.00Best | $15.00 |
| Cache read | $0.20Best | $0.30 |
| Cache write | $2.50 | — |
| Performance | ||
| Throughput | 74.8 tok/s | 97.5 tok/sBest |
| Time to first token | 3.2 s | 3.1 sBest |
| Request success (24h) | 100.0% | 100.0% |
| Benchmark indexes | ||
| Intelligence Index | 38.2Best | 30.1 |
| Coding Index | 71.5Best | 63.0 |
| Capabilities | ||
| Reasoning | Yes | Yes |
| Tools | Yes | Yes |
| Vision | Yes | Yes |
| Structured output | Yes | Yes |
| PDF input | Yes | Yes |
| Reasoning effort | low, medium, high, xhigh, max | low, medium, high, xhigh, max |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- Claude Sonnet 5 Thinking
- Claude Sonnet 4.6 Thinking
Intelligence Index
- Claude Sonnet 5 Thinking38.2
- Claude Sonnet 4.6 Thinking30.1
Claude Sonnet 5 Thinking tested at max reasoning effort
Claude Sonnet 5 Thinking: Better than 82% of 326 scored models
Indexes
Coding Index
Composite of the coding evaluations
- Claude Sonnet 5 Thinking: 71.5Top
- Claude Sonnet 4.6 Thinking: 63.0
Agentic work
AutomationBench-AA
Workflow automation, penalized for guardrail violations
- Claude Sonnet 5 Thinking: 36.5%Top
- Claude Sonnet 4.6 Thinking: 20.1%
AutomationBench-AA tasks completed
Workflows finished end to end without a guardrail violation
- Claude Sonnet 5 Thinking: 10.8%Top
- Claude Sonnet 4.6 Thinking: 3.7%
AA-Briefcasev1.1
Agentic knowledge work, rated head to head
- Claude Sonnet 5 Thinking: 1,357 EloTop
- Claude Sonnet 4.6 Thinking: 1,062 Elo
GDPval-AAv2.1
Economically valuable occupational tasks, rated head to head
- Claude Sonnet 5 Thinking: 1,464 EloTop
- Claude Sonnet 4.6 Thinking: 1,233 Elo
Document reasoning
GDP.pdf
Professional reasoning over PDF documents, all-pass rate
- Claude Sonnet 5 Thinking: 13.2%
- Claude Sonnet 4.6 Thinking: 15.8%Top
AA-LCRv1.1
Reasoning across long documents
- Claude Sonnet 5 Thinking: 82.0%Top
- Claude Sonnet 4.6 Thinking: 80.0%
MLCR-AA
Long-context reasoning over medical records
- Claude Sonnet 5 Thinking: 5.0%
- Claude Sonnet 4.6 Thinking: 7.8%Top
Reasoning and knowledge
Humanity’s Last Exam
Expert-level questions across academic fields
- Claude Sonnet 5 Thinking: 41.3%Top
- Claude Sonnet 4.6 Thinking: 33.6%
GPQA Diamond
Graduate-level science questions
- Claude Sonnet 5 Thinking: 91.1%Top
- Claude Sonnet 4.6 Thinking: 87.5%
IFBench
Following precise output instructions
- Claude Sonnet 5 Thinking: —
- Claude Sonnet 4.6 Thinking: 56.6%
Coding
Terminal-Benchv4.0
Practical software engineering in a terminal
- Claude Sonnet 5 Thinking: 14.1%Top
- Claude Sonnet 4.6 Thinking: 3.0%
SciCode
Scientific computing in Python
- Claude Sonnet 5 Thinking: 54.3%Top
- Claude Sonnet 4.6 Thinking: 50.1%
Legacy evaluations
Terminal-Bench Hard
Earlier terminal task suite
- Claude Sonnet 5 Thinking: —
- Claude Sonnet 4.6 Thinking: 53.0%
τ²-Bench Telecom
Tool use in a customer-support simulation
- Claude Sonnet 5 Thinking: —
- Claude Sonnet 4.6 Thinking: 75.7%
AA-LCR (unversioned)
Long-context reasoning, earlier grading
- Claude Sonnet 5 Thinking: 82.0%Top
- Claude Sonnet 4.6 Thinking: 80.0%
Scores from Artificial Analysis, updated Oct 26, 2026. Claude Sonnet 5 Thinking was tested at max 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
- 74.8 tok/s
- Faster than 50% of 256 models
- Time to first token
- 3.2 s
- Quicker than 47% of 256 models
- Prompt cache hits
- 70.5%
- About $0.73 per 1M input tokens with caching
- Request success (24h)
- 100.0%
- 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-5:thinking",
"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-5:thinking",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)Anthropic
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