The Known Good Updated 25 Jul 2026
Anthropic: Claude Opus 4.6 vs Google: Gemini 3.5 Flash ·Anthropic vs Google

Anthropic: Claude Opus 4.6 vs Google: Gemini 3.5 Flash — head-to-head comparison

Anthropic: Claude Opus 4.6 profile Google: Gemini 3.5 Flash profile All comparisons
Anthropic: Claude Opus 4.6 — Anthropic
Quality
#11 of 61
88based on 5 of 6 evaluations
Known Good Index
Speed
#219 of 316
36.7
Output tokens per second
Price
#315 of 340
$10.00
Blended per 1M tokens
In $5.00 · Out $25.00
Cache hit price
#186 of 206
$0.50
per 1M tokens (−90%)
Context
#85 of 345
1.00M
tokens (~1,500 pages)
Google: Gemini 3.5 Flash — Google
Quality
#3 of 61
95based on 3 of 6 evaluations
Known Good Index
Speed
#31 of 316
119.0
Output tokens per second
Price
#257 of 340
$3.38
Blended per 1M tokens
In $1.50 · Out $9.00
Cache hit price
#127 of 206
$0.15
per 1M tokens (−90%)
Context
#46 of 345
1.05M
tokens (~1,600 pages)
Summary

On the Known Good Index, Anthropic: Claude Opus 4.6 scores 88 and Google: Gemini 3.5 Flash scores 95 — a 7-point lead for Google: Gemini 3.5 Flash. They share 3 published evaluations, with Anthropic: Claude Opus 4.6 ahead on 0 and Google: Gemini 3.5 Flash ahead on 3.

Blended pricing is $10.00 per 1M tokens for Anthropic: Claude Opus 4.6 and $3.38 for Google: Gemini 3.5 Flash — Google: Gemini 3.5 Flash is about 3.0× cheaper.

Throughput is 37 tokens per second for Anthropic: Claude Opus 4.6 and 119 for Google: Gemini 3.5 Flash, with time to first token at 2.1s and 1.7s. Anthropic: Claude Opus 4.6 accepts 1.00M tokens of context against 1.05M.

Anthropic: Claude Opus 4.6 is proprietary; Google: Gemini 3.5 Flash is proprietary. 5 tracked hosts serve one or both, and 1 serve both.

Generated from tracked data on 25 Jul 2026 · how these comparisons are computed →

At a glance
MetricAnthropic: Claude Opus 4.6Google: Gemini 3.5 Flash
Known Good Index 88 based on 5 of 6 evaluations 95 based on 3 of 6 evaluations
Blended $/1M $10.00 $3.38
Output tok/s 37 119
Context window 1.00M 1.05M
Providers 4 2
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Quality

Known Good Index and the capability indices, side by side

IndicesComponents
Index scores

Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.

MetricAnthropic: Claude Opus 4.6Google: Gemini 3.5 Flash
Known Good Index 88 95
Coding Index 89 —
Mathematics Index 93 96
Science Index 95 98
Reasoning Index 84 —
Agentic Index 89 92
Openness Index 5 5
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = Anthropic: Claude Opus 4.6 · marker = Google: Gemini 3.5 Flash · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond91 / 93
MATH / AIME93 / 96
SWE-bench Verified79 / 79

Right-hand figures read Anthropic: Claude Opus 4.6 / Google: Gemini 3.5 Flash. Anthropic: Claude Opus 4.6 leads on 0 of 3, Google: Gemini 3.5 Flash on 3.

The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Arena ratings

Elo from blind pairwise votes, ingested from Arena. Higher is better.

MetricAnthropic: Claude Opus 4.6Google: Gemini 3.5 Flash
Text Arena 1,497 —
Text Arena (style controlled) 1,498 —
The Known Good

Price & Cost

Published API pricing by token type

Per token typeCache discount
Published pricing

USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.

MetricAnthropic: Claude Opus 4.6Google: Gemini 3.5 Flash
Input $/1M $5.00 $1.50
Output $/1M $25.00 $9.00
Blended $/1M $10.00 $3.38
Cache read $/1M $0.500 $0.150
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input accepted and maximum output emitted

Context and output limits

Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.

MetricAnthropic: Claude Opus 4.6Google: Gemini 3.5 Flash
Context window 1.00M 1.05M
Max output tokens 128k 66k
The Known Good

Speed & Latency

Median throughput and time to first token across hosting providers

Output speedTime to first token
Throughput and latency

Medians across all tracked providers, derived from OpenRouter endpoint telemetry.

MetricAnthropic: Claude Opus 4.6Google: Gemini 3.5 Flash
Output tokens/s 37 119
Time to first token 2.1s 1.7s
The Known Good

Providers

Which hosts serve each model, and at what price and speed

5 hosts · 1 serve both
Full provider benchmarks →
Provider Anthropic: Claude Opus 4.6 blendedAnthropic: Claude Opus 4.6 tok/s Google: Gemini 3.5 Flash blendedGoogle: Gemini 3.5 Flash tok/s
Google · first party $10.00 40 $1.69 121
Anthropic · first party $10.00 37 — —
Amazon Bedrock · first party $10.00 33 — —
Azure · first party $10.00 30 — —
Google AI Studio — — $1.69 205

Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.

The Known Good
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Elo — Arena Full attribution →