# Inkling

Inkling is a text generation model from Thinking Machines, available through the Impossibl API. Its published context window is 65,536 tokens. The advertised input rate is $1.87 per million input tokens. The advertised output rate is $4.68 per million output tokens.

- Model identifier: ` thinkingmachines/inkling `
- Creator: Thinking Machines
- Model type: Text generation
- Canonical model page: [Inkling](<https://impossibl.com/thinkingmachines/inkling>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2026-07-15

## Capabilities and limits

- Context window: 65,536 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text, image
- Outputs: text
- Tool calling: Not published

## API access

Use ` thinkingmachines/inkling ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/chat/completions `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $1.87 | per million input tokens |
| Output | $4.68 | per million output tokens |
| Cache read | $0.374 | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | Not published | per million audio input tokens |

## Independent benchmarks

Source: [Artificial Analysis](<https://artificialanalysis.ai/>). Last checked: 2026-09-11T12:23:22.823Z.
Configurations are evaluated separately. API scores retain their original units. Unmeasured scores are omitted.

### Inkling (xhigh)

Source: [Evaluation source](<https://artificialanalysis.ai/models/inkling>)

| Benchmark | Score |
| --- | --- |
| Intelligence Index | 25.54 |
| Omniscience Index | 2.00 |
| GPQA | 87.17% |
| Humanity’s Last Exam | 31.88% |
| SciCode | 46.99% |
| CritPt | 5.43% |
| Terminal-Bench v2.1 | 55.06% |
| Terminal-Bench v4.0 | 1.01% |
| AA-LCR | 77.33% |
| Multilingual LCR | 12.22% |
| GDPval Elo | 1165.19 |
| GDP.pdf All-pass | 12.80% |
| AutomationBench Partial | 4.98% |
| AnalystAgent | 23.75% |
| MMMU-Pro | 73.47% |
| Tau Banking | 29.07% |
| coding index (API) | 52.1 |
| agentic index (API) | 24.3 |
| intelligence index (API) | 25.5 |

Full benchmark data and breakdowns: [Complete benchmark snapshot](<https://api.impossibl.com/v1/models/thinkingmachines/inkling/benchmarks>).


## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is Inkling?

Inkling is a text-generation model from Thinking Machines, available through the Impossibl API.

### How much does Inkling cost?

Inkling costs $1.87 per million input tokens and $4.68 per million output tokens through the Impossibl API. Cache reads cost $0.374 per million tokens. All rates are in USD.

### What is the context length of Inkling?

Inkling has a 65,536-token context window through the Impossibl API.

### What inputs and outputs does Inkling support?

Inkling accepts text and image as input. Inkling returns text.

### How do I use Inkling through an API?

Inkling is available through the Impossibl API. Use thinkingmachines/inkling as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

### When was Inkling released?

Thinking Machines released Inkling on July 15, 2026.

Sources: [Creator release announcement](<https://thinkingmachines.ai/news/introducing-inkling/>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Inkling: model details and pricing](<https://impossibl.com/thinkingmachines/inkling>)
- [Model directory](<https://impossibl.com/models>)