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Model comparison

Claude Mythos 5.1 vs Gemini 4 Argon (restricted preview)

Anthropic against Google, compared on context, price, and attributed benchmark results.

Recorded profile verification October 1, 2026Individual provider fields may changeEvidence confidence: Insufficient data — see receipts below

Anthropic

Claude Mythos 5.1

Frontier

vs

Google

Gemini 4 Argon (restricted preview)

Frontier

AI model capability comparison
SpecificationClaude Mythos 5.1Gemini 4 Argon (restricted preview)
ProviderAnthropicGoogle
TierFrontierFrontier
Context window1MNot verifiedUnverified
Max output128KWinner: 1M
Input / 1M tokens$10Not verifiedUnverified
Output / 1M tokens$50Not verifiedUnverified
WeightsClosedClosed
ParametersNot verifiedUnverifiedNot verifiedUnverified
Reasoning levelslow, medium, high, xhigh, maxNot verifiedUnverified
Modalitiestext, imagetext, image, video
API model idclaude-mythos-5-1Not verifiedUnverified
ReleasedSeptember 1, 2026September 30, 2026
Artificial Analysis Intelligence Index [high] · source date Gemini 4 Argon (restricted preview): 2026-10-01Not verifiedUnverified53
DeepSWE 1.1 · source date Gemini 4 Argon (restricted preview): 2026-10-01Not verifiedUnverified77.9
AutomationBench · source date Gemini 4 Argon (restricted preview): 2026-10-01Not verifiedUnverified51.3
LVBench · source date Gemini 4 Argon (restricted preview): 2026-10-01Not verifiedUnverified91.7

Dates beside benchmark scores refer to the linked source’s publication or capture date unless that source explicitly states when it measured the result. A shared URL alone does not establish comparable runs; unverified setups are marked. Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.

Benchmark receipts

Where each score comes from, and how far it can be compared across models.

Pricing tiers

Claude Mythos 5.1: Standard $10/$50 per MTok, sharing Fable 5.1's specifications/pricing. Cache reads $0.25; 5-minute writes $12.50 and 1-hour writes $20. Batch $5/$25. US-only inference adds 10% where supported. Invite-only for vetted US organisations; API ID claude-mythos-5-1. Retirement not sooner than September 1, 2027; this is a minimum commitment, not an announced shutdown.

Gemini 4 Argon (restricted preview): Google announced a future introductory API price of $2 input / $10 output per million tokens, with 95% off cached input. After the introductory period: $4/$20. These are announced launch rates; general API availability and the introductory end date are not confirmed. Current purchasable token rates are therefore left unverified.

FrontierRecord checked October 1, 2026

Claude Mythos 5.1

Anthropic describes Claude Mythos 5.1 as its most capable model for cybersecurity and biology research — the Fable 5.1 model with fewer cyber/bio safeguards, restricted to vetted US organisations.

Best for

  • Cyber-defence research
  • Biology research
  • Claude Security workloads

Watch out

Invite-only for vetted US organisations through trusted access programmes, with 30-day retention required by default for safety monitoring. Adaptive thinking cannot be disabled and forced tool use errors. Shared underlying model does not make Fable benchmark results Mythos observations; safeguards and access differ.

FrontierRecord checked October 1, 2026

Gemini 4 Argon (restricted preview)

Google’s announced frontier model, initially restricted to trusted cyber defenders in the Fairwind program while broader safeguards and access are prepared.

Best for

  • Long-horizon coding research
  • Enterprise knowledge-work evaluation

Watch out

Restricted preview, not generally available. Google’s API model list does not yet publish a stable model ID or verified context limit. The 1M figure here is the announced maximum output, not a confirmed input context window.

When the cheaper one wins

One of these rows is missing a verified output price, so this page will not name a cheaper winner. Run the model picker against the actual job instead of guessing.

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Evidence confidence: Insufficient data

How strong and complete the evidence behind this comparison is — not a prediction of which model is better. Hard limitations apply: missing pricing; evidence too sparse.

  • Pricing incomplete — No verified token pricing for Gemini 4 Argon (restricted preview).
  • 2/5 core specs verified on both sides — Not published for at least one side: context window, parameter count, reasoning levels.
  • No directly aligned benchmark setup — No benchmark has matching cited sources, source dates, units, effort and recorded run details on both models.
  • Verified within the last 90 days — Older of the two catalog checks was 25 days ago.
  • Both models carry source citations — Each side has at least two catalog sources on record.

Source receipts

Each catalog figure was checked against the provider or an independent second source on the date shown.

Related comparisons

Diving deeper on one model? Claude Mythos 5.1 · Gemini 4 Argon (restricted preview)

Common questions

Claude Mythos 5.1 vs Gemini 4 Argon (restricted preview)

Answered from the verified figures on this page rather than general guidance.

Should I use Claude Mythos 5.1 or Gemini 4 Argon (restricted preview)?
Both are classified in our frontier tier; this editorial grouping does not imply equal capability. Claude Mythos 5.1 is a candidate for cyber-defence research; Gemini 4 Argon (restricted preview) is a candidate for long-horizon coding research. Compare accuracy, tool reliability, latency and cost on representative tasks.

Next step

Choosing between them

The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.

These two models match on every verified catalog figure — the decision comes down to provider preference, availability, and workload fit rather than published numbers.

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