← comparisons · head to head
Gemini 4 Argon vs Claude Opus 5.5
Of the 3 public leaderboards that rate both, Gemini 4 Argon scores higher on 1 and Claude Opus 5.5 on 2. 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 Opus 5.5 at 100 (out of 100).
Scores as published by each board; table composed October 13, 2026.
Get the next launch alert, free →
Leaderboard by leaderboard
| Board | Gemini 4 Argon | Claude Opus 5.5 | Higher |
|---|---|---|---|
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 55.4 | 60.7 | Claude Opus 5.5 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 68.9 | 67 | Gemini 4 Argon |
| Artificial Analysis intelligence index · measured runs only | 52.6 | 57.6 | Claude Opus 5.5 |
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 Opus 5.5 at a glance
- Developer
- Anthropic
- Status
- Live since September 22, 2026
- API price
- $4 input / $20 output per 1M tokens · Anthropic, claude-opus-5-5
- Context window
- 1M tokens
Live — Sep 22 · $4/$20 per MTok, down from Opus 5 at $5/$25 · 1M ctx / 128K out · adaptive thinking always on, default effort medium · cache reads 5% of base input · Anthropic now says start here for most workloads, and Opus 5 is legacy.
Claude Opus 5.5 fast mode costs a third less than GPT-6.1 Sol Ultrafast, but you need an invite
2026-10-10 · Claude Opus 5.5 in fast mode costs a third less than GPT-6.1 Sol Ultrafast on input, output and cached input, going by both companies' own pricing pages, read this morning.
Claude Opus 5.5 ships at $4/$20 - and that is LESS than the Opus 5 it replaces
2026-09-22 · Claude Opus 5.5 is live. Our sweep read the id claude-opus-5-5 at 16:24:44 UTC on September 22 and the alert went out at 16:25:45 - 61 seconds later, to 307 inboxes and one phone. The hunt that caught it was armed the previous day, before the model had a confirmed name, on the version range rather than on the rumour.
Gemini 4 Argon vs Claude Opus 5.5: quick answers
Which is better, Gemini 4 Argon or Claude Opus 5.5?
It depends on what you measure. Of the 3 public leaderboards that rate both, Gemini 4 Argon scores higher on 1 and Claude Opus 5.5 on 2. Gemini 4 Argon's widest lead is on Vals AI; Claude Opus 5.5's widest lead is on LLM Stats. 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 Opus 5.5 at 100 (out of 100).
Which is newer, Gemini 4 Argon or Claude Opus 5.5?
Gemini 4 Argon. It went live on October 13, 2026, 21 days after Claude Opus 5.5 (September 22, 2026).
Who makes Gemini 4 Argon and Claude Opus 5.5?
Gemini 4 Argon is from Google; Claude Opus 5.5 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.
More comparisons
Hear the minute the next one drops. Free.
A free Chrome push the moment a new model answers on a public API, an email about 15 minutes later. Texts or a phone call on paid plans.
- Free forever
- No card
- Unsubscribe in one click
Also: the bench index · API pricing · the wire