Upstage Solar Mini 4 Goes Free and Unlimited Inside Freebuff's Coding Agent

James Grugett announced on October 3, 2026 that Solar Mini 4 is free and unlimited inside the Freebuff coding agent. This article separates that promotion from

tau · October 3, 2026

#Solar Mini 4 #Upstage #Freebuff

Upstage Solar Mini 4 Goes Free and Unlimited Inside Freebuff's Coding Agent

On October 3, 2026 at 10:19 AM KST, verified account James Grugett (@jahooma) posted on X that Upstage's compact model Solar Mini 4 is free and unlimited inside his team's coding agent, with a link to freebuff.com. When asked in a reply whether it covers all countries, he answered directly: "It's for all countries!"

Abstract illustration of a compact AI coding assistant running inside a code editor, no readable text

Image source: James Grugett (@jahooma) X post

This is a distribution story about one coding agent's offer, not a claim that the model itself became free. Describing it as a "fast and efficient workhorse" is the poster's marketing language, not an independently verified benchmark conclusion.

Solar Mini 4's Official Specs and Release Timeline

Solar Mini 4 belongs to South Korean lab Upstage's small-model lineup. It is a 35-billion-parameter mixture-of-experts model that activates only about 3 billion parameters per inference step to maximize efficiency.

The official model documentation lists the September 22, 2026 release version, followed by a formal announcement on October 1. Both Upstage's announcement and third-party writeups describe it as targeting agentic workloads where response speed and cost matter more than peak capability, including repeated classification, extraction, and tool calls.

What Is Free, and What Still Costs Money

The key distinction: "free and unlimited" applies inside the Freebuff agent as described by its promoter. It does not mean the Upstage API itself is free.

Upstage's standard list price confirmed on October 2 is $0.10 per million input tokens, $0.01 per million cached input tokens, and $0.40 per million output tokens, excluding 10% VAT. A separate launch-period API discount promotion has been reported, but reports disagree on the exact discount rate and end date, so it should not be conflated with the Freebuff offer.

  • Inside Freebuff (poster claim): Solar Mini 4 available free and unlimited in the coding agent; poster says all countries are covered.
  • Upstage official API (standard rate): $0.10 input / $0.01 cached input / $0.40 output per 1M tokens, plus 10% VAT.
  • Unconfirmed: actual rate limits, fair-use policy, and the promotion's end date are absent from public evidence.

Sources