← all releases · September 2026
AI models released in September 2026
27 models went live in September 2026, 7 of them frontier models. Each date is the day ArtificialWatch verified the model live on a public API, not the day it was announced.
By lab: OpenAI 6 · Anthropic 4 · Ant Group 1 · Circuit & Chisel 1 · DeepSeek 1 · Fireworks AI 1 · Google 1 · IFM 1 · Meituan 1 · Meta 1 · NEX AGI 1 · Perceptron 1 · PrismML 1 · Sakana AI 1 · Sapiens AI 1 · Shanghai AI Lab 1 · StepFun 1 · xAI 1 · Xiaomi 1
- Sep 30Ling 3.1 Flash · Ant Group
- Sep 29GPT-6.1 Sol · OpenAIfrontier · $2 / $10 per 1M tokens · bench index 82.6
- Sep 28Claude Sonnet 5.5 · Anthropicfrontier · $2 / $10 per 1M tokens · bench index 93.5
- Sep 27LongCat 2.5 · Meituan
- Sep 25Perceptron Mk1.5 · Perceptron
- Sep 24Ember-1 · Fireworks AI
- Sep 22Claude Opus 5.5 · Anthropicfrontier · $4 / $20 per 1M tokens · bench index 100
- Sep 22GPT-6 Luna · OpenAI$0.10 / $0.50 per 1M tokens · bench index 28.6
- Sep 22GPT-6 Sol · OpenAI$2 / $10 per 1M tokens · bench index 68.6
- Sep 21Grok 4.7 · xAIfrontier · $2 / $6 per 1M tokens · bench index 59.9
- Sep 21MiMo-V2.6 · Xiaomi$0.435 / $0.87 per 1M tokens · bench index 65.1
- Sep 20Step 5 Preview · StepFun
- Sep 18Ternary Bonsai 2 27B · PrismML
- Sep 17Pareto · Circuit & Chisel
- Sep 11Atria Dawn · Shanghai AI Lablimited preview
- Sep 11Sakana Fugu · Sakana AI
- Sep 10DeepSeek V4.1 Flash · DeepSeekbench index 67.4
- Sep 10GPT-Live-1 · OpenAI
- Sep 9Agnes 3.0 Flash · Sapiens AI
- Sep 8GPT-Image-2.5 · OpenAI
- Sep 8Nex-N2.5 · NEX AGI
- Sep 3GPT-6 Astra · OpenAIfrontier · $10 / $50 per 1M tokens · bench index 87.4
- Sep 3K2 Horizon · IFM
- Sep 2Gemini 3.8 Flash · Google$0.75 / $3.75 per 1M tokens · bench index 43.3
- Sep 2Muse Spark 1.3 · Meta$1.25 / $4.25 per 1M tokens · bench index 74.9
- Sep 1Fable 5.1 · Anthropicfrontier · $10 / $50 per 1M tokens · bench index 90.7
- Sep 1Mythos 5.1 · Anthropicfrontier
Prices and bench index are today’s figures, not launch-day ones.
Quick answers
How many AI models were released in September 2026?
27 that ArtificialWatch tracks, from 19 labs. OpenAI shipped the most (6). Each date is the day the model went live on a public API, not the day it was announced.
What frontier AI models came out in September 2026?
Mythos 5.1, Fable 5.1, GPT-6 Astra, Grok 4.7, Claude Opus 5.5, Claude Sonnet 5.5 and GPT-6.1 Sol, in that order, starting September 1, 2026.
How they compare: the LLM leaderboard, head-to-heads and API prices. When each launch was first seen, to the minute: the track record.
Know the minute the next one drops. Free.
Free: a Chrome push and an email about 15 minutes after a new model answers on a public API. Members get a text or a phone call the moment a launch is confirmed.
- Free forever
- No card
- Unsubscribe in one click