Saad Ullah
● With backing from Cerebras, Cognition AI has launched SWE-1.5, a coding agent that's rewriting the rules on speed and performance. Now live on the Windsurf platform, it hits 950 tokens per second, making it 13 times quicker than Sonnet 4.5 while outperforming both GPT-5 and Haiku 4.5 on industry benchmarks.
● The main concern is the trade-off between speed and depth. Traditionally, coding models focused on accuracy over throughput, forcing developers to pick one or the other. SWE-1.5 breaks that pattern using custom reinforcement learning and overhauled infrastructure. Still, some worry this speed race could push smaller teams into unsustainable compute costs.
● On the business side, SWE-1.5 cuts task completion from minutes to seconds, slashing cloud costs and boosting margins for AI dev teams. Running on Cerebras' hardware makes it more efficient and budget-friendly compared to slower, bulkier models like GPT-5.
● Performance-wise, SWE-1.5 scored 40.08% on SWE-Bench Pro—nearly double Opus 4.1's 22.71% from two months prior. This jump proves Cognition's approach works: end-to-end RL, constant tuning, and real-world testing. By owning the entire stack—model, inference, and agent—Cognition sets a new standard for AI labs.
● As Cerebras put it, "SWE-1.5 is the first coding agent that finishes complex software tasks in seconds, not minutes." Together, these milestones mark a shift from static models to fully autonomous, lightning-fast coding agents.
Saad Ullah
