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OpenAI's Navier-Stokes release comes with a Lean 4 formal proof10/09/26 · OpenAI|OpenAI publishes documentation for its Agents API10/09/26 · OpenAI|OpenAI Launches the Agents API, a Managed Service for Cloud Agents10/09/26 · OpenAI|Anthropic Accused of Building a Predictive Surveillance System Targeting Activists09/09/26 · Anthropic|OpenAI Claims a Millennium Prize Problem Solved, Controversy Follows09/09/26 · OpenAI|Mistral AI Raises €3 Billion to Push Open-Weight Models to the Frontier08/09/26 · Mistral AI|OpenAI agents hijacked a German wiki before the Hugging Face breach07/09/26 · OpenAI|New GPU compiler speeds up counterfactual regret minimization by up to 80x10/09/26|Anthropic releases September 2026 report on malicious use of AI10/09/26 · Anthropic|Skild AI Uses NVIDIA Physical AI to Teach Robots New Tasks From a Single Video10/09/26 · Skild AI|NVIDIA Outlines Its Role as Technology Backbone for Robotaxi Leaders10/09/26 · NVIDIA|A researcher uses Codex and ChatGPT to hunt for new antimicrobial molecules10/09/26 · OpenAI|OpenAI's Navier-Stokes release comes with a Lean 4 formal proof10/09/26 · OpenAI|OpenAI publishes documentation for its Agents API10/09/26 · OpenAI|OpenAI Launches the Agents API, a Managed Service for Cloud Agents10/09/26 · OpenAI|Anthropic Accused of Building a Predictive Surveillance System Targeting Activists09/09/26 · Anthropic|OpenAI Claims a Millennium Prize Problem Solved, Controversy Follows09/09/26 · OpenAI|Mistral AI Raises €3 Billion to Push Open-Weight Models to the Frontier08/09/26 · Mistral AI|OpenAI agents hijacked a German wiki before the Hugging Face breach07/09/26 · OpenAI|New GPU compiler speeds up counterfactual regret minimization by up to 80x10/09/26|Anthropic releases September 2026 report on malicious use of AI10/09/26 · Anthropic|Skild AI Uses NVIDIA Physical AI to Teach Robots New Tasks From a Single Video10/09/26 · Skild AI|NVIDIA Outlines Its Role as Technology Backbone for Robotaxi Leaders10/09/26 · NVIDIA|A researcher uses Codex and ChatGPT to hunt for new antimicrobial molecules10/09/26 · OpenAI|

nAIvigate · Barometer

The AI model market in September 2026

157 models tracked. Figures computed on September 11 from verified model sheets and the daily history. Free to reuse with attribution (CC BY 4.0).

Daily history available since September 7: this month's variations cover a partial window.

Median input price
1.25 $/ M tokens
45 models with a verified public price
Median output price
4.25 $/ M tokens
no change over 4 day(s) of snapshots
Average Trust Index
81/ 100
157 documented models · 125 good, 26 mid, 6 low · 0 undocumented
Self-hostable
76 %
119 of 157 models · in the cloud, 16 with EU residency, 13 on request
Trust Index, open-weight
91/ 100
average over 119 open-weight models
Trust Index, proprietary
53/ 100
average over 38 proprietary models

Trust Index: top 5

  1. 1. Mistral Large 398/100
  2. 2. StarCoder 296/100
  3. 3. FLUX.2 [klein] 4B96/100
  4. 4. Magistral Small96/100
  5. 5. Mistral Nemo 12B96/100

Cheapest (input + output)

  1. 1. Yi-Lightning0.14 / 0.14 $
  2. 2. DeepSeek Coder V30.14 / 0.28 $
  3. 3. DeepSeek V3.20.28 / 0.42 $
  4. 4. Mistral Small 30.2 / 0.6 $
  5. 5. Mixtral 8x22B0.6 / 0.6 $

Method

Prices in US dollars per million tokens, collected from vendor pricing pages and OpenRouter, median over models with a verified public price. Trust Index: 16 documented criteria in 5 families, an undocumented criterion scores 0, only models with 50%+ coverage enter the average. Variations: first and last daily snapshot of the month (384 snapshots, September 7 to September 10). No placement is sold, no figure is produced by an LLM.

Cite: "nAIvigate Barometer, September 2026", https://naivigate.com/en/barometre/2026-09