Developer API
Updated Oct 19, 2026
Fortytwo Engine
Fortytwo Engine is an inference API in which several cooperating AI models shape a shared reasoning path while the answer is being generated. The company says it cuts wasted output and cost on coding and agent tasks.
- From
- Fortytwo
- Launched
- Oct 15, 2026
What it does
- Runs multiple cooperating models that guide one another’s reasoning, aiming to catch weak reasoning early and use fewer tokens.
- Is compatible with the OpenAI Chat Completions API, so existing SDKs can work by changing the API key and base URL.
- Supports function tools, parallel tool calls, structured output and a selectable reasoning-effort level.
- Supports Chat Completions and model listing only. Responses, Embeddings, Audio, Files and Assistants are not supported.
Who it is for
Developers and teams building AI agents, especially coding agents where token costs add up.
Price and availability
Price
The coverage gave no list prices. Fortytwo says the Engine keeps its per-token price at the base model’s level. A separate on-premises offering, Fortytwo Harbor, uses a fixed hardware cost instead of per-token billing.
Availability
- Launched on October 15, 2026, through Fortytwo’s developer platform.
- Its first supported model is Qwen 3.8 27B.
Worth knowing before you try it
Check these first
- All performance figures are the company’s own and were not independently verified in the coverage.
- Fortytwo reports 24.7% fewer tokens across 450 DeepSWE runs than the base model alone (12.3 million versus 16.3 million tokens per run on average), along with higher scores on several benchmarks. The token figure applies to those runs only, not to every workload.
- Unsupported request fields return errors rather than being ignored, so check your requests against its compatibility guide and test on your own tasks.
Questions people ask
Does Fortytwo Engine work with my existing OpenAI SDK code?
For Chat Completions, yes: the company says you can change the API key and base URL. Responses, Embeddings, Audio, Files and Assistants are not supported.
Are the 24.7% savings guaranteed?
No. That figure is Fortytwo’s own result on 450 DeepSWE runs and may not apply to your workload.
Sources
This profile is based on the reporting below. Read the full story there.
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