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Anthropic · Frontier

Claude 4.6 Opus Thinking Low

Added Feb 5, 2026

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Use in the app

Claude Opus 4.6 with adaptive thinking (effort: low).

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
Input
Text, Images
Output
Text
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$5.00
Output
$25.00
Cache read
$0.50

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
128K
Average output (7 days)
1.6K tokens
Longer than 87% of 473 models

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Public evaluations

Benchmarks

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

Intelligence Index

31.9

Tested at max reasoning effort

Better than 74% of 326 scored models

3.8Catalog models by score55.1

Document reasoning

  • AA-LCRv1.1

    78.0%

    Reasoning across long documents

    Better than 65% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    39.9%

    Expert-level questions across academic fields

    Better than 76% of 323 scored models

  • GPQA Diamond

    89.6%

    Graduate-level science questions

    Better than 75% of 291 scored models

  • IFBench

    53.1%

    Following precise output instructions

    Better than 53% of 215 scored models

Legacy evaluations

  • Terminal-Bench Hard

    46.2%

    Earlier terminal task suite

    Better than 88% of 212 scored models

  • τ²-Bench Telecom

    92.1%

    Tool use in a customer-support simulation

    Better than 78% of 214 scored models

  • 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 4.6 Opus Thinking Low was tested at max reasoning effort; compare scores measured at the same effort.Artificial Analysis

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-opus-4.6:thinking:low",
    "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-opus-4.6:thinking:low",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Anthropic

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