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Gemini 4 Argon vs Claude Opus 5.5

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Language Models · verified 20 Oct 2026

Gemini 4 ArgonGooglecurrent
Claude Opus 5.5Anthropiccurrent
3 slots left
SpecificationGemini 4 ArgonClaude Opus 5.5
SummaryFirst on one independent board, fifth on another, and cheap until December.Fable 5.1's level of work on most tasks, at 40% less to run than Opus 5.
Context1M1M
Input ($/Mtok)$2$4
Output ($/Mtok)$10$20
LicenceProprietaryProprietary
Max output262K128K
ParametersNot publishedNot published
Released30 Sep 2026, GA 13 Oct22 Sep 2026
Model IDgemini-4-argonclaude-opus-5-5
CategoryLanguage ModelsLanguage Models
OfficialGoogle ↗Anthropic ↗

Highlighted rows are where these differ.

Gemini 4 Argon

  • The price doubles to $4 and $20 on 1 December, and cached input is discounted 95%
  • First of 41 on the Vals Index at 68.90%, but 52.6 on Artificial Analysis against 57.6 for Opus 5.5
  • 77.9 on DeepSWE v1.1 in Google's table, and 55.0 on FrontierSWE v2 where GPT-6 Astra scores 65.5

Best for frontier work while the introductory rate lasts.

Full spec sheet →

Claude Opus 5.5

  • 66.4% on Terminal-Bench 4.0 against 52.3% for Opus 5, on Anthropic's own harness
  • Cache reads cut 60% to $0.20, and output more than 30% faster than Opus 5
  • Attempts to work around its boundaries 85% less often than Opus 5, Anthropic reports

Best for agentic coding at flagship quality.

Full spec sheet →