MiniMax lists M3.1 Flash, an open-weight model

MiniMax's model release notes add MiniMax M3.1 Flash, dated October 19, 2026. MiniMax describes it as "an ultra-efficient open-weight model for everyday work". That is the vendor's own description.

MiniMax's launch blog post, shared on Hacker News, adds the following. All figures are MiniMax's own claims and are not independently verified.

• Availability: the model is available through the MiniMax API, M Plan and MiniMax Code. The post says model weights "will be released later", so the open-weight release is announced, not yet delivered. A larger "Pro" model is said to come later.
• Pricing: flat $0.15 per 1M input tokens, $0.60 per 1M output tokens and $0.015 per 1M cached input tokens; MiniMax's API pricing page lists the same figures.
• Speed and cost: MiniMax says online inference is nearly three times faster and usage costs are 70% lower than before, with output speeds of 200+ tokens per second.
• Benchmarks (MiniMax's figures): 73.7% on DeepSWE v1.1, 61.7 on OSWorld V2 and 29.6 on Agents' Last Exam; it says the last two rank first among Chinese models. It also says the model ranks among the top performers on AutomationBench-AA.
• OpenRouter: the model is also listed on OpenRouter as "MiniMax: MiniMax M3.1 Flash", with a 1,048,576-token context length (first listed as 1,000,000).
• MiniMax says the anonymous "Space Bunny" model, which it says processed more than 200 trillion tokens, was an early version of M3.1 Flash.