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Gemini 4 Argon vs Claude Fable 5.1
Of the 3 public leaderboards that rate both, Gemini 4 Argon scores higher on 2 and Claude Fable 5.1 on 1. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 4 Argon is at 86.1 and Claude Fable 5.1 at 90.7 (out of 100).
Scores as published by each board; table composed October 13, 2026.
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Leaderboard by leaderboard
| Board | Gemini 4 Argon | Claude Fable 5.1 | Higher |
|---|---|---|---|
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 55.4 | 53.6 | Gemini 4 Argon |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 68.9 | 65.8 | Gemini 4 Argon |
| Artificial Analysis intelligence index · measured runs only | 52.6 | 53.4 | Claude Fable 5.1 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
Gemini 4 Argon at a glance
- Developer
- Status
- Live since October 13, 2026
Live — Oct 13 · GA as gemini-4-argon on the Gemini API (Google changelog), also in AI Studio, Vertex AI, the Gemini app and Antigravity · $2 / $10 per 1M through Nov 30, 2026, then $4 / $20 from Dec 1; cached input $0.10, then $0.20 (implicit caching only) · Batch and Flex half price, Priority $3.60 / $18 · not on the Free tier or the Google AI Pro plan · 1,048,576-token context shared by input and output; 65,536 max output by default, up to 1,048,576 with long decode · thinking low / medium / high · knowledge cutoff March 2026 (model card) · Google's own table: ahead of Claude Opus 5.5 on 14 of 18 shared rows, behind on FrontierSWE v2 (55.0 vs 62.3), Terminal-Bench 4.0 (57.4 vs 66.4), PostTrainBench and Terminal-Bench Science · Artificial Analysis Intelligence Index (read Oct 13): 52.6 at high, level with GPT-6 Astra (52.7), behind Opus 5.5 (57.6), Sonnet 5.5 (56.0), Muse Wonder Full (55.8) and Fable 5.1 (53.4) · #1 on the Vals Index (68.9%) · our sweep fired at 15:45 UTC · announced Sep 30 for Fairwind trusted testers first · the newer Gemini 4 checkpoints Business Insider reported Oct 9 (Barium, Carbon) file under the next-Gemini-4 hunt.
Gemini 4 Argon ships at $2 / $10 until December 1, then the price doubles
2026-10-13 · Gemini 4 Argon is generally available. Google's Gemini API changelog lists gemini-4-argon as GA on October 13, "our most capable model built for complex coding, agentic, math, and science tasks", and it is in AI Studio, Vertex AI, the Gemini app and Antigravity. Our sweep fired at 15:45 UTC.
Google is testing a newer Gemini 4 called Carbon inside its coding tool, Business Insider reports
2026-10-09 · Google employees are testing a newer Gemini 4 model internally named Carbon, Business Insider reported at 19:37 UTC today, citing internal documents and screenshots. It was made available in Jetski, Google's internal coding platform, in recent days.
Claude Fable 5.1 at a glance
- Developer
- Anthropic
- Status
- Live since September 1, 2026
- API price
- $10 input / $50 output per 1M tokens · Anthropic, claude-fable-5-1
- Context window
- 1M tokens
Live - sticker price held at $10/$50, but cache reads cut 75% to $0.25 = ~25% cheaper typical, up to ~45% agentic · 1M ctx · effort low-max.
Claude Fable 5.1 is live — the sticker price never moved, and the cache read fell 75%
2026-09-01 · Claude Fable 5.1 shipped today, alongside Claude Mythos 5.1. Our radar detected it at 17:52:22 UTC and confirmed it on the next sweep 60 seconds later.
Fable 5.1's August window has closed — the market now prices September at 78%, and one claim in the leak can't be checked at all
2026-08-20 · A claim going round today says Fable 5.1 is in pre-release testing, targeted at September, and running inside Anthropic's own products under the Fable 5 name. One part of that is checkable, one part is checkable and slipping, and one part is — by construction — invisible to anything we can measure.
Gemini 4 Argon vs Claude Fable 5.1: quick answers
Which is better, Gemini 4 Argon or Claude Fable 5.1?
It depends on what you measure. Of the 3 public leaderboards that rate both, Gemini 4 Argon scores higher on 2 and Claude Fable 5.1 on 1. Gemini 4 Argon's widest lead is on LLM Stats; Claude Fable 5.1's widest lead is on Artificial Analysis. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 4 Argon is at 86.1 and Claude Fable 5.1 at 90.7 (out of 100).
Which is newer, Gemini 4 Argon or Claude Fable 5.1?
Gemini 4 Argon. It went live on October 13, 2026, 42 days after Claude Fable 5.1 (September 1, 2026).
Who makes Gemini 4 Argon and Claude Fable 5.1?
Gemini 4 Argon is from Google; Claude Fable 5.1 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 13, 2026). Boards measure different things, so raw scores are only comparable within a row.
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