# Trinity Large Thinking

> Trinity Large Thinking is an open-weight language model from Arcee AI, released on 1 Apr 2026. It accepts text and generates text, with a 262K-token context window and up to 80K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.25 per million input tokens and $0.80 per million output tokens (OpenRouter), across 2 providers we track.

Source page: https://www.aimodel.directory/models/trinity-large-thinking
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Arcee AI
- **Release date:** 1 Apr 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Weights:** Open weights (source: Hugging Face, https://huggingface.co/arcee-ai/Trinity-Large-Thinking)
- **License:** openmdw-1.1 (source: Hugging Face, https://huggingface.co/arcee-ai/Trinity-Large-Thinking)
- **Parameters:** 399B (source: Hugging Face, https://huggingface.co/arcee-ai/Trinity-Large-Thinking)
- **Context window:** 262K (262,144 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Max output:** 80K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Structured output:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml)
- **Hugging Face:** arcee-ai/Trinity-Large-Thinking (source: Hugging Face, https://huggingface.co/arcee-ai/Trinity-Large-Thinking)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.25 | $0.80 | $0.06 | 262K |
| Vercel AI Gateway | $0.25 | $0.90 | – | 262K |

## FAQ

### What is the context window of Trinity Large Thinking?

Trinity Large Thinking has a context window of 262,144 tokens (262K) and can generate up to 80,000 tokens in a single response, according to models.dev.

### How much does the Trinity Large Thinking API cost?

Trinity Large Thinking is listed from $0.25 per million input tokens and $0.80 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is Trinity Large Thinking open source?

Trinity Large Thinking is an open-weight model: its weights are published on Hugging Face as arcee-ai/Trinity-Large-Thinking under the openmdw-1.1 license. Check the license terms before commercial use.

### When was Trinity Large Thinking released?

Arcee AI released Trinity Large Thinking on 1 Apr 2026, according to models.dev.

### Which providers offer Trinity Large Thinking?

We track Trinity Large Thinking on 2 providers: OpenRouter, Vercel AI Gateway.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Trinity Large Thinking", https://www.aimodel.directory/models/trinity-large-thinking