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thinkingmachines · Open weights

Inkling Small Thinking

Added Jul 31, 2026Open weights

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Use in the app

The reasoning version of Thinking Machines' 276B-parameter open-weights multimodal Mixture-of-Experts model with 12B active parameters. It reasons over text and images, and is designed for agentic coding, tool use, instruction following, and long workflows with controllable thinking effort.

  • Reasoning
  • Tools
  • Vision
  • Audio input
Input
Text, Images, Audio
Output
Text
Reasoning effort
minimal · low · medium · high · max
Discovery tier
Open weights

Pricing

USD per 1M tokens
Input
$0.45
Output
$1.20
Cache read
$0.10

Reference prices as published by the model provider. API example

Specifications

Context window
524.3K
Max output
32.8K

Side by side

Inkling Small Thinking compared

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

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Inkling Small ThinkingthinkingmachinesThis modelGrok 4.20xAIRemove
ProviderthinkingmachinesxAI
Discovery tierOpen weightsBalanced
AddedJul 31, 2026Mar 31, 2026
Limits
Context window524.29K2MBest
Max output32.77K131.07KBest
Average output—679 tokens
Pricing, USD per 1M tokens
Input$0.45Best$1.25
Output$1.20Best$2.50
Cache read$0.10Best$0.20
Performance
Throughput—90.2 tok/s
Time to first token—1.9 s
Request success (24h)—99.9%
Benchmark indexes
Intelligence Index25.725.7
Coding Index52.9—
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputNoYes
Audio inputYesNo
Reasoning effortminimal, low, medium, high, max—

Public evaluations

Benchmarks

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

  • Inkling Small Thinking
  • Grok 4.20

Intelligence Index

  • Inkling Small Thinking25.7
  • Grok 4.2025.7

Inkling Small Thinking: Better than 62% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • Inkling Small Thinking: 52.9
    • Grok 4.20: —

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Inkling Small Thinking: 4.8%
    • Grok 4.20: —

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Inkling Small Thinking: 0.6%
    • Grok 4.20: —

  • Harvey LAB-AAv1.1

    Legal tasks passed in full, with no material hallucination

    • Inkling Small Thinking: 0.0%
    • Grok 4.20: —

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Inkling Small Thinking: 911 Elo
    • Grok 4.20: —

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Inkling Small Thinking: 1,124 Elo
    • Grok 4.20: —

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Inkling Small Thinking: 11.2%
    • Grok 4.20: —

  • AA-LCRv1.1

    Reasoning across long documents

    • Inkling Small Thinking: 75.7%Top
    • Grok 4.20: 69.0%

  • MLCR-AA

    Long-context reasoning over medical records

    • Inkling Small Thinking: 7.8%
    • Grok 4.20: —

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Inkling Small Thinking: 33.3%
    • Grok 4.20: 34.5%Top

  • GPQA Diamond

    Graduate-level science questions

    • Inkling Small Thinking: 89.5%
    • Grok 4.20: 91.1%Top

  • IFBench

    Following precise output instructions

    • Inkling Small Thinking: —
    • Grok 4.20: 81.2%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Inkling Small Thinking: 1.0%
    • Grok 4.20: —

  • SciCode

    Scientific computing in Python

    • Inkling Small Thinking: 49.7%
    • Grok 4.20: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • Inkling Small Thinking: —
    • Grok 4.20: 37.9%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • Inkling Small Thinking: —
    • Grok 4.20: 93.0%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Inkling Small Thinking: 75.7%Top
    • Grok 4.20: 69.0%

Scores from Artificial Analysis, updated Oct 26, 2026. 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": "thinkingmachines/Inkling-Small: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="thinkingmachines/Inkling-Small:thinking",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

thinkingmachines

Other thinkingmachines models, starting with the same family.