Cognition

SWE-1.5

Name: SWE-1.5
Author: Cognition

SWE-1.5 is a Cognition model with Not verified context, Not verified in / Not verified out per million tokens, last verified October 2, 2026. Open weights: not verified. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.

A prior software-engineering agent model documented in the Windsurf launch and retained here as a historical reference.

Recorded profile verification October 2, 2026Individual provider fields may change

AI model specification details
Specification	SWE-1.5
Provider	Cognition
Tier	Balanced
Context window	Not verifiedUnverified
Max output	Not verifiedUnverified
Input / 1M tokens	Not verifiedUnverified
Output / 1M tokens	Not verifiedUnverified
Weights	Not verifiedUnverified
Parameters	Hundreds of billions (publisher; exact count unverified)
Reasoning levels	Not verifiedUnverified
Modalities	text
Released	October 29, 2025

Pricing tiers: In-product model access and billing vary by plan/account. Exact current model-specific rates were not recovered; the authenticated List Models response is the account source of truth. Historical free/speed offers are not current generic API prices.

Best for

Understanding earlier SWE agent references and the 1.6 training lineage

Watch out

Exact context/output caps, stable generic inference API ID, downloadable weights/licence and model-specific numeric parameter count are unverified. The authenticated List Models endpoint returns account model-menu UIDs and plan-specific pricing; its placeholder examples are not live prices or general inference endpoints. Do not inherit base-model, harness or sibling benchmark scores; vendor speed/evaluation claims are not independent cross-model results. The publisher disclosed hundreds of billions of parameters but no exact count. The 950 tok/s and comparisons are historical vendor claims.

Source receipts

Catalog figures for this model were checked against the following sources.

Current in-product model roles and access (accessed 2026-10-02)
Publisher announcement / model identity (accessed 2026-10-02)
Account-dependent List Models response contract (accessed 2026-10-02)
Quota and extra usage (accessed 2026-10-02)

Common questions

SWE-1.5

Answered from the verified figures on this page rather than general guidance.

What is SWE-1.5 best for?

SWE-1.5 is a balanced tier from Cognition. It suits understanding earlier swe agent references and the 1.6 training lineage. Exact context/output caps, stable generic inference API ID, downloadable weights/licence and model-specific numeric parameter count are unverified. The authenticated List Models endpoint returns account model-menu UIDs and plan-specific pricing; its placeholder examples are not live prices or general inference endpoints. Do not inherit base-model, harness or sibling benchmark scores; vendor speed/evaluation claims are not independent cross-model results. The publisher disclosed hundreds of billions of parameters but no exact count. The 950 tok/s and comparisons are historical vendor claims.

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