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Anthropic · Frontier

Claude Sonnet Latest

Added Mar 1, 2026

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Use in the app

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

Claude Sonnet Latest compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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Claude Sonnet LatestAnthropicThis modelClaude Sonnet 5 ThinkingAnthropicRemove
ProviderAnthropicAnthropic
Discovery tierFrontierFrontier
AddedMar 1, 2026Jun 30, 2026
Limits
Context window1M1M
Max output128K128K
Average output1K tokens2.6K tokens
Pricing, USD per 1M tokens
Input$2.00$2.00
Output$10.00$10.00
Cache read$0.10Best$0.20
Cache write$2.50$2.50
Performance
Throughput237.9 tok/sBest74.8 tok/s
Time to first token5.4 s3.2 sBest
Request success (24h)99.1%100.0%Best
Benchmark indexes
Intelligence Index46.8Best38.2
Coding Index—71.5
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
PDF inputYesYes
Reasoning effortlow, medium, high, xhigh, maxlow, medium, high, xhigh, max

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Claude Sonnet Latest
  • Claude Sonnet 5 Thinking

Intelligence Index

  • Claude Sonnet Latest46.8
  • Claude Sonnet 5 Thinking38.2

Claude Sonnet Latest tested at high reasoning effort

Claude Sonnet Latest: Better than 93% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • Claude Sonnet Latest: —
    • Claude Sonnet 5 Thinking: 71.5

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Claude Sonnet Latest: 59.4%Top
    • Claude Sonnet 5 Thinking: 36.5%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Claude Sonnet Latest: 29.4%Top
    • Claude Sonnet 5 Thinking: 10.8%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Claude Sonnet Latest: 1,635 EloTop
    • Claude Sonnet 5 Thinking: 1,357 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Claude Sonnet Latest: 1,548 EloTop
    • Claude Sonnet 5 Thinking: 1,464 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Claude Sonnet Latest: 25.2%Top
    • Claude Sonnet 5 Thinking: 13.2%

  • AA-LCRv1.1

    Reasoning across long documents

    • Claude Sonnet Latest: 78.0%
    • Claude Sonnet 5 Thinking: 82.0%Top

  • MLCR-AA

    Long-context reasoning over medical records

    • Claude Sonnet Latest: 18.9%Top
    • Claude Sonnet 5 Thinking: 5.0%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Claude Sonnet Latest: 45.8%Top
    • Claude Sonnet 5 Thinking: 41.3%

  • GPQA Diamond

    Graduate-level science questions

    • Claude Sonnet Latest: —
    • Claude Sonnet 5 Thinking: 91.1%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Claude Sonnet Latest: 43.9%Top
    • Claude Sonnet 5 Thinking: 14.1%

  • SciCode

    Scientific computing in Python

    • Claude Sonnet Latest: 53.7%
    • Claude Sonnet 5 Thinking: 54.3%Top

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Claude Sonnet Latest: 78.0%
    • Claude Sonnet 5 Thinking: 82.0%Top

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
237.9 tok/s
Faster than 89% of 256 models
Time to first token
5.4 s
Quicker than 26% of 256 models
Prompt cache hits
0.0%
About $2.00 per 1M input tokens with caching
Request success (24h)
99.0%
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.

Hourly request success · last 72 hoursLowest hour 96.9%
  • 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.

Read the quickstart
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

Other Anthropic models, starting with the same family.