Monthly signal
The standout launches, model drops, and platform moves worth tracking.
AI releases in September 2025
In September 2025, we tracked 25 releases from 8 companies. That is down 1 from August 2025 (26). Google Gemini shipped the most (5), then Hume AI (5) and Anthropic (3).
Releases
25
August 2025: 26
Companies shipping
8
August 2025: 10
Most shipped
Model
8 releases
Key launches in September 2025
- Model
Google Gemini
Gemini 2.5 Flash Model Release
Gemini 2.5 Flash, a low-latency and cost-efficient model, will soon be available in Vertex AI.
- Model
Anthropic
Introducing Claude Sonnet 4.5
Introduces Claude Sonnet 4.5, the most capable coding model with improvements in reasoning, math, and computer use. Includes upgrades to Claude Code, API, and product features like checkpoints and VS Code extension.
- Model
Anthropic
Claude Sonnet 4.5 Launch
Introducing Claude Sonnet 4.5, the most capable coding model with improvements in reasoning, math, and computer use. Includes upgrades to Claude Code, API, and apps, along with the Claude Agent SDK for developers.
- Model
OpenAI
GPT-5-Codex in the API
GPT-5-Codex is now available in the Responses API, and you can also use it with your API Key in the Codex CLI.
- Model
OpenAI
GPT-5-Codex
GPT-5-Codex is a version of GPT-5 further optimized for agentic coding in Codex, available in the IDE extension and CLI with ChatGPT sign-in. It also adds image outputs for front-end tasks in the cloud, codex resume and automatic context compaction in the CLI.
- Model
Google Gemini
Image Generation Model Update
Firebase Studio now uses gemini-2.5-flash-image-preview (Nano Banana) model for image generation.
- Product
Ollama
Web search
Ollama introduces a web search API with a free tier and cloud-based rate limits, enhancing model accuracy by reducing hallucinations. Integrates with Python and JavaScript libraries for research tasks.
- Product
Ollama
New model scheduling
Ollama introduces improved model scheduling system with exact memory management, reducing OOM crashes, maximizing GPU utilization, and enhancing multi-GPU performance. Includes metrics improvements and support for new models.
Who shipped most
Releases per company in September 2025. Each name opens that company's September 2025 changelog.
Through the month
Releases by day of the month, across every company. A longer bar is a busier stretch.
- Days 1–75
- Days 8–144
- Days 15–217
- Days 22–284
- Days 29–305
By category
- Model8
- API7
- Product7
- Developer Tools3
Every AI release in September 2025
Grouped by company, busiest first, with each company's latest releases. Titles open the entry on the company's month page; source links go to the official announcement.
September 2025 AI releases FAQ
What AI models were released in September 2025?
Model releases we tracked in September 2025 include Gemini 2.5 Flash Model Release from Google Gemini (September 30, 2025), Introducing Claude Sonnet 4.5 from Anthropic (September 29, 2025) and Claude Sonnet 4.5 Launch from Anthropic (September 29, 2025). Each one is listed below with a link to the official announcement.
Which AI company shipped the most in September 2025?
Google Gemini shipped the most, with 5 releases, mostly Product. Hume AI was next with 5.
How many AI releases were there in September 2025?
We tracked 25 releases from 8 companies in September 2025. A release is one announced change, so a major model launch and a small fix each count once.
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