SWE-1.5

Parameters

300B

Published

Oct 29, 2025

SWE-1.5 is an AI model developed by Cognition (United States), first published in October 2025. It works in the language domain, on tasks such as code generation.

Epoch AI has no training-compute estimate for this model. The model has 300,000,000,000 parameters. Training ran on NVIDIA GB200.

Access: Hosted access (no API). Its weights are not openly released. Epoch AI rates the confidence of this record as likely.

Full record

Organization: Cognition
Country of organization: United States
Domain: Language
Task: Code generation
Parameters: 300,000,000,000
Training hardware: NVIDIA GB200
Model accessibility: Hosted access (no API)
Open weights: No
Epoch confidence: Likely