Gemini 4 Argon

AI Agent

Gemini 4 Argon is Google's October 2026 frontier reasoning model for complex software engineering, enterprise knowledge work (legal, finance, science), cybersecurity defense, and long-horizon agents. API id gemini-4-argon; paid Gemini API only (not Free tier); 1M unified input-output token limit.

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Features & details

Full overview from our catalog (read-only reference).

Category (short)

AI Agent

Sponsored note

Target audience

Developers & engineers

Best for

Teams that need Google's flagship reasoning model for agentic coding and hard multi-step work and can pay API or Pro/Ultra rates. Not ideal for: free-tier API users or cheap Flash-class workloads.

Pricing notes

Verified October 17, 2026 at https://ai.google.dev/gemini-api/docs/pricing (gemini-4-argon). Standard: $2 input / $10 output per 1M through Nov 30, 2026; $4 / $20 from Dec 1, 2026. Context cache (implicit only): $0.10 then $0.20. Batch and Flex: ~50% of Standard ($1/$5 intro; $2/$10 after). Priority: $3.60/$18 intro; $7.20/$36 after. Grounding with Google Search/Maps: 5,000 free requests/month shared across Gemini 3+ then $14 per 1,000. Consumer access via Google AI Pro/Ultra. Confirm live pricing before budgeting.

Pros & cons

Editorial notes to help compare fit before opening the vendor site.

Pros

Clear intro pricing then transparent Dec 1 cliff
1M unified context for long agent/coding jobs
Ships across API, Antigravity, Gemini app/Search for paid consumers

Cons

No Free-tier API access
Intro rates expire Nov 30, 2026 (roughly 2x Standard after)
Thinking tokens billed as output
long agent runs can get expensive

Review notes

Context from the listing review and editorial research.

NEW tool (batch 22). Model/API surface for the directory (like GPT-6.1 Sol / Muse Spark). DISAMBIGUATION: not Gemini Flash / 3.8 Flash workhorse; not the generic Gemini app listing alone (see slug gemini); not Google Antigravity product alone (harness). Announced Sep 30 Fairwind-first; GA Oct 13, 2026. Vendor benches (Vals Index etc.) are harness-dependent. Last verified: October 17, 2026.

Extended features

In-depth description and capability notes.

API model id gemini-4-argon Frontier coding, agentic multi-step work, science/math, legal/finance knowledge work, cyber defense 1M unified input-output token limit via Gemini API (continuation protocol for long decode) Surfaces: Gemini API paid tier, AI Studio, Gemini for business, Google Antigravity (Ultra), Gemini app + AI Mode (Pro/Ultra) Not available on Gemini API Free tier Cyber: Fairwind Program for trusted defenders (reduced cyber guardrails) Standard intro through Nov 30, 2026: $2 / 1M input, $10 / 1M output; cached input $0.10 Standard from Dec 1, 2026: $4 / $20; cached $0.20 (implicit cache only) Batch/Flex at ~50% of Standard; Priority higher (see pricing notes)

Use cases

Developers and enterprises run hard coding refactors, long agent loops, professional document work, and cyber defense workflows through the paid Gemini API, Antigravity, or Gemini for business.