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Thinking Machines

Inkling (256K) API

Thinking Machines
About

Build advanced reasoning agents with Inkling (256K), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $3.74/1M input and $9.36/1M output tokens, native tool calling support, open weights architecture. Access Inkling (256K) via the Thinking Machines API with up to 262K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
262K

Tokens

Input Limit
262K

Tokens

Max Output
262K

Tokens

Pricing

Standard (per 1M tokens)

Input
$3.74
Output
$9.36

Caching (per 1M tokens)

Read
$0.75
Frequently Asked Questions

Inkling (256K) by Thinking Machines costs $3.74 per 1M input tokens and $9.36 per 1M output tokens. Cached reads cost $0.75 per 1M tokens.

Model Details
ID
thinkingmachines/Inkling:peft:262144
Provider
Thinking Machines
Family
ling
Release Date
Jul 15, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/anthropic
Environment Variables
TINKER_API_KEY
API Base URL
https://tinker.thinkingmachines.dev/services/tinker-prod/anthropic/api/v1
Documentation