GLM-4.6
GLM-4.6 expanded coding capabilities and context length.
For buildersTest changes across a larger repository.
Updated
AI models released in September 2025
7 model releases from 6 providers in September 2025, with announcement dates, official sources, and practical notes for builders.
Releases this month
Dates refer to the linked announcement or release milestone. Previews are labeled in the entries; historical availability and pricing may have changed.
Release details
Sora 2
Sora 2 introduced video with synchronized dialogue and sound effects. The Sora product was later discontinued in April 2026.
For buildersA historical example of integrating video and audio generation into one model.
Claude Sonnet 4.5
Sonnet 4.5 launched with advances in coding, computer use, and complex agent workflows.
For buildersEvaluate long-running agents on completion quality, recovery from errors, and total cost.
DeepSeek V3.2-Exp
An experimental model introduced DeepSeek Sparse Attention for more efficient long-context processing.
For buildersLong-context efficiency matters for repeated analysis of large documents or codebases.
Luma Ray3
Luma unveiled a reasoning-driven video model with creative controls and an HDR production pipeline.
For buildersExplore generated shots that need controlled transitions and consistent visual direction.
GPT-5-Codex
OpenAI released a GPT-5 model specialized for agentic software development.
For buildersEvaluate a complete repository change with implementation and test execution.
Kimi K2 0905
An updated Kimi K2 improved agentic coding and expanded its context window to 256K.
For buildersUse a multi-file app change to assess whether longer context translates into better implementation.