The Known Good Updated 25 Jul 2026
Google: Gemini 3.5 Flash vs OpenAI: o1 ·Google vs OpenAI

Google: Gemini 3.5 Flash vs OpenAI: o1 — head-to-head comparison

Google: Gemini 3.5 Flash profile OpenAI: o1 profile All comparisons
Google: Gemini 3.5 Flash — Google
Quality
#3 of 61
95based on 3 of 6 evaluations
Known Good Index
Speed
#31 of 316
119.1
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)
OpenAI: o1 — OpenAI
Quality
#30 of 61
63based on 4 of 6 evaluations
Known Good Index
Speed
#264 of 316
24.4
Output tokens per second
Price
#330 of 340
$26.25
Blended per 1M tokens
In $15.00 · Out $60.00
Cache hit price
#206 of 206
$7.50
per 1M tokens (−50%)
Context
#216 of 345
200k
tokens (~300 pages)
Summary

On the Known Good Index, Google: Gemini 3.5 Flash scores 95 and OpenAI: o1 scores 63 — a 32-point lead for Google: Gemini 3.5 Flash. They share 2 published evaluations, with Google: Gemini 3.5 Flash ahead on 2 and OpenAI: o1 ahead on 0.

Blended pricing is $3.38 per 1M tokens for Google: Gemini 3.5 Flash and $26.25 for OpenAI: o1 — Google: Gemini 3.5 Flash is about 7.8× cheaper.

Throughput is 119 tokens per second for Google: Gemini 3.5 Flash and 24 for OpenAI: o1, with time to first token at 1.7s and 1.4s. Google: Gemini 3.5 Flash accepts 1.05M tokens of context against 200k.

Google: Gemini 3.5 Flash is proprietary; OpenAI: o1 is proprietary. 3 tracked hosts serve one or both.

Generated from tracked data on 26 Jul 2026 · how these comparisons are computed →

At a glance
MetricGoogle: Gemini 3.5 FlashOpenAI: o1
Known Good Index 95 based on 3 of 6 evaluations 63 based on 4 of 6 evaluations
Blended $/1M $3.38 $26.25
Output tok/s 119 24
Context window 1.05M 200k
Providers 2 1
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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.

MetricGoogle: Gemini 3.5 FlashOpenAI: o1
Known Good Index 95 63
Mathematics Index 96 85
Science Index 98 78
Reasoning Index — 62
Agentic Index 92 —
Openness Index 5 5
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = Google: Gemini 3.5 Flash · marker = OpenAI: o1 · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond93 / 77
MATH / AIME96 / 73

Right-hand figures read Google: Gemini 3.5 Flash / OpenAI: o1. Google: Gemini 3.5 Flash leads on 2 of 2, OpenAI: o1 on 0.

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.

Neither model currently appears in an arena we ingest.

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.

MetricGoogle: Gemini 3.5 FlashOpenAI: o1
Input $/1M $1.50 $15.00
Output $/1M $9.00 $60.00
Blended $/1M $3.38 $26.25
Cache read $/1M $0.150 $7.500
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.

MetricGoogle: Gemini 3.5 FlashOpenAI: o1
Context window 1.05M 200k
Max output tokens 66k 100k
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.

MetricGoogle: Gemini 3.5 FlashOpenAI: o1
Output tokens/s 119 24
Time to first token 1.7s 1.4s
The Known Good

Providers

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

3 hosts
Full provider benchmarks →
Provider Google: Gemini 3.5 Flash blendedGoogle: Gemini 3.5 Flash tok/s OpenAI: o1 blendedOpenAI: o1 tok/s
Google AI Studio $1.69 124 — —
Google · first party $1.69 117 — —
OpenAI · first party — — $26.25 —

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) Full attribution →