# Google launches Gemini 4 Argon in Japan with up to 1 million-token context

Digest AI · Generative AI & Models · published 2026-10-20T18:49:00Z

Canonical: https://digestai.news/story/google-launches-gemini-4-argon-in-japan-with-up-to-1-million-token-con

## Summary

Google introduced Gemini 4 Argon, its newest flagship reasoning model, for the Japanese market on October 14, 2026. The model can handle a shared context of about 1.04 million tokens and generate up to 65,536 tokens in a synchronous API call. Google markets Argon for tasks such as contract analysis, financial data synthesis, video summarisation, and multi‑step business automation, and it supports text, images, video, audio, and PDFs.

Pricing in Japan starts at ¥2,900 per month for the AI Pro plan and ¥14,500 per month for AI Ultra, with a higher‑tier Ultra option at ¥32,000. API usage is billed separately: introductory rates until 30 Nov 2026 are $2 per million input tokens and $10 per million output tokens, rising to $4 and $20 respectively from 1 Dec 2026. Official benchmarks show Argon scoring 68.9% on the Vals Index, beating GPT‑6 Astra (63.1%) and Claude Opus 5.5 (67.0%), and achieving 19.6% on a legal benchmark, far above its rivals. The guide also offers ten copy‑paste prompts for immediate business use.

## Key points

- Gemini 4 Argon processes up to 1.04 million tokens total, with a max synchronous output of 65,536 tokens.
- Japanese pricing: AI Pro ¥2,900/month, AI Ultra from ¥14,500/month; API intro pricing $2 input/$10 output per million tokens until 30 Nov 2026.
- Benchmarks: Argon 68.9% Vals Index, 65.4% Vals Finance, 19.6% legal benchmark, outperforming GPT‑6 Astra and Claude Opus 5.5 in most categories.

## Why it matters

A million‑token context and strong specialised‑knowledge scores let Japanese businesses automate document‑heavy workflows, while the tiered pricing makes high‑end AI accessible to SMEs.

## Sources

1. [2026 Latest Gemini 4 Argon Complete Guide | Has it surpassed ChatGPT and Claude? The true power of Google's strongest AI and 10 practical prompts to transform your work](https://note.com/kohsaku_y/n/n6684b4eebbf4?hl=en) (note.com, 2026-10-20)

Part of the developing story: [Gemini Argon Launch Amidst AI Code Shift](https://digestai.news/thread/gemini-4-argon-built-to-solve-your-hardest-problems) (8 stories)

## Cite

Digest AI, "Google launches Gemini 4 Argon in Japan with up to 1 million-token context", 20 October 2026, https://digestai.news/story/google-launches-gemini-4-argon-in-japan-with-up-to-1-million-token-con

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