Trinity Large Thinking
Summary
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.
Reasoning-optimized 398B MoE agent model with extended thinking for long-horizon and multi-turn tool use
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Arcee AI |
|---|---|
| Release date | 1 Apr 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Open weights [Hugging Face] |
| License | openmdw-1.1 [Hugging Face] |
| Parameters | 399B [Hugging Face] |
| Context window | 262K (262,144 tokens) [models.dev] |
| Max output | 80K tokens [models.dev] |
| Input | Text [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | No [models.dev] |
| Hugging Face | arcee-ai/Trinity-Large-Thinking [Hugging Face] |
Trinity Large Thinking API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter arcee-ai/trinity-large-thinking | $0.25 | $0.80 | $0.06 | 262K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway arcee-ai/trinity-large-thinking | $0.25 | $0.90 | – | 262K | models.dev, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.
Sources
- https://openrouter.ai/arcee-ai/trinity-large-thinking
- https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/arcee-ai/trinity-large-thinking.toml
- https://huggingface.co/arcee-ai/Trinity-Large-Thinking
- https://github.com/sst/models.dev/blob/dev/providers/vercel/models/arcee-ai/trinity-large-thinking.toml