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The free Inkling endpoint is only available for use with agentic harnesses. Do not upload any confidential information or personal data (e.g., voices and images of people's faces). Your usage of this free endpoint, including prompts and outputs, is logged and used to improve Thinking Machines Lab's models, products, and services. The logged session data will be disassociated from your account and other persistent identifiers before being used for these purposes.

By using this free endpoint, you agree to the TML Free Research API Terms of Service(opens in new tab). For more information about Thinking Machines Lab's data processing practices, see this Privacy Notice(opens in new tab).

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Thinking Machines: Inkling (free)

thinkingmachines/inkling:free

Model weights
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Inkling is an open-weight multimodal mixture-of-experts model from Thinking Machines Lab, with 41B active parameters out of 975B total. It is designed for general-purpose reasoning, coding, agentic and tool-use systems, retrieval-augmented generation, instruction following, and multilingual conversational applications. Its native image and audio understanding supports multimodal analysis alongside text.

Modalities

Price

Free

Context

262K

Released

Jul 17, 2026

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ProvidersPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Exacto (highest tool-calling accuracy).

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Explore models like this

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
FreeFree1.13s58 tps
99.97%

Throughput

58tok/s

P50, best across providers

Latency

1.13s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Bench
DeepInfra
82.0%--
BaseTen
79.8%61.2%
Uptime (3d)

99.65%

Availability (3d)

99.61%

Availability over the last 3 days

Last 72 hours
Availability 99.61%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.51%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

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About Thinking Machines: Inkling (free)

OpenRouter makes Thinking Machines: Inkling (free) available through a unified, OpenAI-compatible API using the model ID thinkingmachines/inkling:free. It is served by Thinking Machines.

Thinking Machines: Inkling (free) accepts text, images and audio and returns text. It has a 262,144-token context window and a maximum output of 262,144 tokens.

It was released on July 17, 2026.

More models from Thinking Machines

  • Inkling Small

Frequently asked questions

Inkling is an open-weight multimodal mixture-of-experts model from Thinking Machines Lab, with 41B active parameters out of 975B total. It is designed for general-purpose reasoning, coding, agentic and tool-use systems, retrieval-augmented generation, instruction following, and multilingual conversational applications.

Yes. The pricing shown on this page for Inkling (free) is zero, so you are not charged for prompt or completion tokens. Free endpoints are rate limited — see the rate limit docs.

Inkling (free) has a 262,144 token context window. It supports up to 262,144 completion tokens.

Yes. Inkling (free) accepts tools for function calling. It does not support response_format, so JSON output is not enforced.

Inkling (free) accepts text, images and audio as input and returns text.

Inkling Small is another text model from Thinking Machines.

Inkling (free) was released on July 17, 2026.