Pairwise benchmark snapshot · Aug 16, 2026

Gemini 3 Flash vs OpenAI: o3 Mini benchmark

Name: Gemini 3 Flash vs OpenAI: o3 Mini AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Gemini 3 Flash (Google) and OpenAI: o3 Mini (OpenAI) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, OpenAI: o3 Mini is ahead by 65 points (1,560 vs 1,495; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, OpenAI: o3 Mini resolves 78.5% versus 75.8% (seed-bootstrap (Aug 1, 2026)). Gemini 3 Flash streams faster (190 tok/s) while Gemini 3 Flash is the cheaper output token ($3/1M). Gemini 3 Flash has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

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Google

Gemini 3 Flash

Fast Google frontier-adjacent model. Near-top official SWE-bench at a fraction of Opus price.

Elo 1,495$3/1M out

OpenAI

OpenAI: o3 Mini

Auto-discovered from OpenRouter (openai/o3-mini). Preview until a second source matches.

Elo 1,560$4.4/1M out

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Model A

Model B

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Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Gemini 3 Flash (5)vsOpenAI: o3 Mini (5)

Gemini 3 Flash: 5W (50%)Overall: Even matchupOpenAI: o3 Mini: 5W (50%)

← Gemini 3 FlashOpenAI: o3 Mini →

OpenAI: o3 Mini (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,495vs1,560

Coding Elo

1,510vs1,585

SWE-bench

75.8%vs78.5%

LiveBench

66.8%vs72.4%

GPQA Diamond

78.4%vs87.2%

Gemini 3 Flash: 0WOpenAI: o3 Mini: 5W

Gemini 3 Flash (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

190 tok/svs92 tok/s

Time to first token

95 msvs290 ms

Gemini 3 Flash: 2WOpenAI: o3 Mini: 0W

Gemini 3 Flash (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$3/1Mvs$4.4/1M

Input price

$0.5/1Mvs$1.1/1M

Context window

1Mvs200k

Gemini 3 Flash: 3WOpenAI: o3 Mini: 0W

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect

Percentile 0–100

Dimensional AdvantageEven 3–3

Preference Elo

OpenAI: o3 Mini

65 pts advantage

Throughput Speed

Gemini 3 Flash

98 tok/s faster

Price Efficiency

Gemini 3 Flash

$1.40/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,495

EloHigh is better

1,560+4%

Code Elo

High is better

1,510

Code EloHigh is better

1,585+5%

LiveBench

High is better

66.8%

LiveBenchHigh is better

72.4%+8%

SWE-bench

High is better

75.8%

SWE-benchHigh is better

78.5%+4%

GPQA

High is better

78.4%

GPQAHigh is better

87.2%+11%

TTFT

Low is better

+205%95 ms

TTFTLow is better

290 ms

Speed

High is better

+107%190 tok/s

SpeedHigh is better

92 tok/s

In $

Low is better

+120%$0.5/1M

In $Low is better

$1.1/1M

Out $

Low is better

+47%$3/1M

Out $Low is better

$4.4/1M

Context

High is better

+424%1M

ContextHigh is better

200k

Interactive Simulator

Workload Cost & Savings Calculator

Simulate monthly production API costs based on published $/1M tokens.

Save up to 40% with Gemini 3 Flash

Monthly Volume50M tokens/mo

Quick Presets:

Token Ratio (In vs Out)70% In / 30% Out

RAG / Search (10% out)Coding / Chat (50% out)

Gemini 3 Flash$62.50 / mo

In: $17.50Out: $45.00

OpenAI: o3 Mini$104.50 / mo

In: $38.50Out: $66.00

Estimated Cost Delta

Gemini 3 Flash is estimated to save $42.00/month ($504/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
OpenAI: o3 Mini:Pick OpenAI: o3 Mini when repo-level coding accuracy is the constraint.
2
Gemini 3 Flash:Pick Gemini 3 Flash when you are optimizing output cost.
3
Gemini 3 Flash:Pick Gemini 3 Flash when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsOpenAI: o3 Mini

Higher SWE-bench (78.5%).

High-volume chatGemini 3 Flash

Lower output list price ($3/1M).

Voice / low-latency UIGemini 3 Flash

Lower TTFT (95 ms).

Long-document RAGGemini 3 Flash

Larger window (1M).

Screenshots / visionGemini 3 Flash

Gemini 3 Flash is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	OpenAI: o3 Mini	Higher SWE-bench (78.5%).
High-volume chat	Gemini 3 Flash	Lower output list price ($3/1M).
Voice / low-latency UI	Gemini 3 Flash	Lower TTFT (95 ms).
Long-document RAG	Gemini 3 Flash	Larger window (1M).
Screenshots / vision	Gemini 3 Flash	Gemini 3 Flash is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news

launchMar 16, 2026

Gemini 3 Flash: near-top official SWE-bench at a fraction of Opus

March 2026 speed SKU. Still a useful cheap-coding compare even after 3.6/3.7 Flash.

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LIVE

Google

Gemini 3 Flash

Elo 1,495

LiveBench66.8%

SWE-bench75.8%

Speed190 tok/s

Output cost$3/1M

OpenAI

OpenAI: o3 Mini

Elo 1,560

LiveBench72.4%

SWE-bench78.5%

Speed92 tok/s

Output cost$4.4/1M

Frequently Asked Questions

Which is better overall, Gemini 3 Flash or OpenAI: o3 Mini?: OpenAI: o3 Mini has the higher preference Elo in our latest snapshot (1,560). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Gemini 3 Flash or OpenAI: o3 Mini?: OpenAI: o3 Mini leads SWE-bench at 78.5% vs 75.8%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Gemini 3 Flash output tokens are $3/1M versus $4.4/1M. Input prices and retry rates still move the real bill.
Which is faster, Gemini 3 Flash or OpenAI: o3 Mini?: Gemini 3 Flash has the lower time-to-first-token (95 ms vs 290 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Gemini 3 Flash accepts 1M tokens versus 200k.
Can I self-host either model?: Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?: No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?: Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Gemini 3 Flash and OpenAI: o3 Mini Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Gemini 3 Flash matchups →|All OpenAI: o3 Mini matchups →

Gemini 3 Flash vs Gemini 2.5 Flash (previous gemini-flash)Gemini 3 Flash vs Gemini 3.6 Flash (next gemini-flash)OpenAI: o3 Mini vs OpenAI o1-mini (previous gpt-mini)OpenAI: o3 Mini vs GPT-5 mini (next gpt-mini)Gemini 2.0 Flash Thinking vs Gemini 3 Flash Gemini 3.7 Flash vs OpenAI: o3 Mini

Gemini 3 Flash vs OpenAI: o3 Mini benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Gemini 3 Flash (5)vsOpenAI: o3 Mini (5)

Gemini 3 Flash: 5W (50%)Overall: Even matchupOpenAI: o3 Mini: 5W (50%)

← Gemini 3 FlashOpenAI: o3 Mini →

OpenAI: o3 Mini (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,495vs1,560

Coding Elo

1,510vs1,585

SWE-bench

75.8%vs78.5%

LiveBench

66.8%vs72.4%

GPQA Diamond

78.4%vs87.2%

Gemini 3 Flash: 0WOpenAI: o3 Mini: 5W

Gemini 3 Flash (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

190 tok/svs92 tok/s

Time to first token

95 msvs290 ms

Gemini 3 Flash: 2WOpenAI: o3 Mini: 0W

Gemini 3 Flash (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$3/1Mvs$4.4/1M

Input price

$0.5/1Mvs$1.1/1M

Context window

1Mvs200k

Gemini 3 Flash: 3WOpenAI: o3 Mini: 0W

Recommended Workload Routing

Repo / coding agentsOpenAI: o3 Mini

Higher SWE-bench (78.5%).

High-volume chatGemini 3 Flash

Lower output list price ($3/1M).

Voice / low-latency UIGemini 3 Flash

Lower TTFT (95 ms).

Long-document RAGGemini 3 Flash

Larger window (1M).

Screenshots / visionGemini 3 Flash

Gemini 3 Flash is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	OpenAI: o3 Mini	Higher SWE-bench (78.5%).
High-volume chat	Gemini 3 Flash	Lower output list price ($3/1M).
Voice / low-latency UI	Gemini 3 Flash	Lower TTFT (95 ms).
Long-document RAG	Gemini 3 Flash	Larger window (1M).
Screenshots / vision	Gemini 3 Flash	Gemini 3 Flash is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, Gemini 3 Flash or OpenAI: o3 Mini?

OpenAI: o3 Mini has the higher preference Elo in our latest snapshot (1,560). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Gemini 3 Flash or OpenAI: o3 Mini?

OpenAI: o3 Mini leads SWE-bench at 78.5% vs 75.8%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Gemini 3 Flash output tokens are $3/1M versus $4.4/1M. Input prices and retry rates still move the real bill.

Which is faster, Gemini 3 Flash or OpenAI: o3 Mini?

Gemini 3 Flash has the lower time-to-first-token (95 ms vs 290 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Gemini 3 Flash accepts 1M tokens versus 200k.

Can I self-host either model?

Neither model is marked open-weights here. You are comparing hosted APIs.

Are these scores from CompareLLM’s own evals?

No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.

What does preference Elo mean on this page?

Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Gemini 3 Flash and OpenAI: o3 Mini Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

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Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

OpenAI: o3 Mini

Gemini 3 Flash

Gemini 3 Flash

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Gemini 3 Flash: near-top official SWE-bench at a fraction of Opus

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Gemini 3 Flash

OpenAI: o3 Mini

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

OpenAI: o3 Mini

Gemini 3 Flash

Gemini 3 Flash

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Gemini 3 Flash: near-top official SWE-bench at a fraction of Opus

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

Gemini 3 Flash

OpenAI: o3 Mini

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons