Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

Gemini 3 Flash vs OpenAI: GPT-5.6 Terra Pro benchmark

Name: Gemini 3 Flash vs OpenAI: GPT-5.6 Terra Pro AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Gemini 3 Flash (Google) and OpenAI: GPT-5.6 Terra Pro (OpenAI) using the latest snapshots we have as of Aug 17, 2026. Gemini 3 Flash wins on output price at $3/1M. OpenAI: GPT-5.6 Terra Pro has the larger context window (1.1M 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.

Share Analysis:

WhatsApp Telegram X / Post LinkedIn Reddit

Google

Gemini 3 Flash

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

Flash TurboElo 1,495$3/1M out

OpenAI

OpenAI: GPT-5.6 Terra Pro

Auto-discovered from OpenRouter (openai/gpt-5.6-terra-pro). Preview until a second source matches.

$6/1M out

Model Lineage & Multi-Tier Derivatives🇺🇸 US Frontier

Gemini 3 Series Family (5 models)

Compare vs Base (Gemini 3 Pro)

Gemini 3 Pro

Google

Flagship Base

CoT Scaler

Elo

1552

Speed

92 tok/s

Price

$5.00 / 1M

View model →vs this

Gemini 3 Flash

Google

Flash Turbo

Elo

1495

Speed

190 tok/s

Price

$3.00 / 1M

-57 Elo-40% cost2.1x speed

Viewing now

Gemini 3.6 Pro

Google

Derivative

CoT Scaler

Elo

1570

Speed

102 tok/s

Price

$5.00 / 1M

+18 Elo0% cost1.1x speed

View model →vs this

Gemini 3.6 Flash

Google

3.6 Flash

Elo

1506

Speed

198 tok/s

Price

$3.75 / 1M

-46 Elo-25% cost2.2x speed

View model →vs this

Gemini 3.7 Flash

Google

3.7 Flash Speed

Elo

1530

Speed

215 tok/s

Price

$1.88 / 1M

-22 Elo-62% cost2.3x speed

View model →vs this

Swap or Add Any Model to this Matchup

Instant pairwise benchmark recalculation across 400+ LLMs

Model A

Model B

Quick vs:vs Claude Opus 4.5 vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Gemini 3 Flash (9)vsOpenAI: GPT-5.6 Terra Pro (1)

Gemini 3 Flash: 9W (90%)Overall: Gemini 3 FlashOpenAI: GPT-5.6 Terra Pro: 1W (10%)

← Gemini 3 FlashOpenAI: GPT-5.6 Terra Pro →

Gemini 3 Flash (5/5)

Intelligence & Reasoning

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

Preference Elo

1,495vs—

Coding Elo

1,510vs—

SWE-bench

75.8%vs—

LiveBench

66.8%vs—

GPQA Diamond

78.4%vs—

Gemini 3 Flash: 5WOpenAI: GPT-5.6 Terra Pro: 0W

Gemini 3 Flash (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

190 tok/svs—

Time to first token

95 msvs—

Gemini 3 Flash: 2WOpenAI: GPT-5.6 Terra Pro: 0W

Gemini 3 Flash (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$3/1Mvs$6/1M

Input price

$0.5/1Mvs$1/1M

Context window

1Mvs1.1M

Gemini 3 Flash: 2WOpenAI: GPT-5.6 Terra Pro: 1W

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 AdvantageGemini 3 Flash 5/6

Preference Elo

No shared data

Throughput Speed

No shared data

Token Price Efficiency

Gemini 3 Flash

$3.00/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,495

EloHigh is better

—

Code Elo

High is better

1,510

Code EloHigh is better

—

LiveBench

High is better

66.8%

LiveBenchHigh is better

—

SWE-bench

High is better

75.8%

SWE-benchHigh is better

—

GPQA

High is better

78.4%

GPQAHigh is better

—

TTFT

Low is better

95 ms

TTFTLow is better

—

Speed

High is better

190 tok/s

SpeedHigh is better

—

In $

Low is better

+100%$0.50 / 1M

In $Low is better

$1.00 / 1M

Out $

Low is better

+100%$3.00 / 1M

Out $Low is better

$6.00 / 1M

Context

High is better

ContextHigh is better

1.1M

Interactive Simulator (USD)

Workload Cost & Savings Calculator

Simulate monthly production API costs in USD (US Dollar).

Save up to 50% 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: $17.5Out: $45

OpenAI: GPT-5.6 Terra Pro$125.00 / mo

In: $35Out: $90

Estimated Cost Delta

Gemini 3 Flash is estimated to save $62.50/month ($750/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Gemini 3 Flash:Pick Gemini 3 Flash when you are optimizing output cost.
2
OpenAI: GPT-5.6 Terra Pro:Pick OpenAI: GPT-5.6 Terra Pro for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatGemini 3 Flash

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

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGOpenAI: GPT-5.6 Terra Pro

Larger window (1.1M).

Screenshots / visionGemini 3 Flash

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

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	insufficient data	Need SWE-bench on both sides.
High-volume chat	Gemini 3 Flash	Lower output list price ($3/1M).
Voice / low-latency UI	insufficient data	Need TTFT on both sides.
Long-document RAG	OpenAI: GPT-5.6 Terra Pro	Larger window (1.1M).
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.

Community Sentiment

Cast Your Matchup Vote

0 total votes

Community Discussions (0)

No comments posted on this matchup yet. Be the first to share an evaluation note!

Share card

The real PNG is generated at /compare/gemini-3-flash-vs-gpt-5-6-terra-pro/opengraph-image for crawlers.

PNG

CompareLLM Matrix

Verified head-to-head card

LIVE

Google

Gemini 3 Flash

Elo 1,495

LiveBench66.8%

SWE-bench75.8%

Speed190 tok/s

Output cost$3/1M

OpenAI

OpenAI: GPT-5.6 Terra Pro

Elo n/a

LiveBench—

SWE-bench—

Speed—

Output cost$6/1M

Frequently Asked Questions

Which is better overall, Gemini 3 Flash or OpenAI: GPT-5.6 Terra Pro?: We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, Gemini 3 Flash or OpenAI: GPT-5.6 Terra Pro?: SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?: Gemini 3 Flash output tokens are $3/1M versus $6/1M. Input prices and retry rates still move the real bill.
Which is faster, Gemini 3 Flash or OpenAI: GPT-5.6 Terra Pro?: We do not have TTFT for both models.
Which has the larger context window?: OpenAI: GPT-5.6 Terra Pro accepts 1.1M tokens versus 1M.
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: GPT-5.6 Terra Pro 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: GPT-5.6 Terra Pro matchups →

Gemini 3 Flash vs Gemini 2.5 Flash (previous gemini-flash)Gemini 3 Flash vs Gemini 3.6 Flash (next gemini-flash)Gemini 2.0 Flash Thinking vs Gemini 3 Flash Gemini 3.7 Flash vs Gemini 3 Flash GPT-4.5 Orion vs Gemini 3 Flash GPT-5.6 Terra vs Gemini 3 Flash

Gemini 3 Flash vs OpenAI: GPT-5.6 Terra Pro benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Gemini 3 Flash (9)vsOpenAI: GPT-5.6 Terra Pro (1)

Gemini 3 Flash: 9W (90%)Overall: Gemini 3 FlashOpenAI: GPT-5.6 Terra Pro: 1W (10%)

← Gemini 3 FlashOpenAI: GPT-5.6 Terra Pro →

Gemini 3 Flash (5/5)

Intelligence & Reasoning

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

Preference Elo

1,495vs—

Coding Elo

1,510vs—

SWE-bench

75.8%vs—

LiveBench

66.8%vs—

GPQA Diamond

78.4%vs—

Gemini 3 Flash: 5WOpenAI: GPT-5.6 Terra Pro: 0W

Gemini 3 Flash (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

190 tok/svs—

Time to first token

95 msvs—

Gemini 3 Flash: 2WOpenAI: GPT-5.6 Terra Pro: 0W

Gemini 3 Flash (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$3/1Mvs$6/1M

Input price

$0.5/1Mvs$1/1M

Context window

1Mvs1.1M

Gemini 3 Flash: 2WOpenAI: GPT-5.6 Terra Pro: 1W

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatGemini 3 Flash

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

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGOpenAI: GPT-5.6 Terra Pro

Larger window (1.1M).

Screenshots / visionGemini 3 Flash

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

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	insufficient data	Need SWE-bench on both sides.
High-volume chat	Gemini 3 Flash	Lower output list price ($3/1M).
Voice / low-latency UI	insufficient data	Need TTFT on both sides.
Long-document RAG	OpenAI: GPT-5.6 Terra Pro	Larger window (1.1M).
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: GPT-5.6 Terra Pro?

We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.

Which is better at coding, Gemini 3 Flash or OpenAI: GPT-5.6 Terra Pro?

SWE-bench is missing for at least one model, so we do not rank coding from a single number.

Which is cheaper to run in production?

Gemini 3 Flash output tokens are $3/1M versus $6/1M. Input prices and retry rates still move the real bill.

Which is faster, Gemini 3 Flash or OpenAI: GPT-5.6 Terra Pro?

We do not have TTFT for both models.

Which has the larger context window?

OpenAI: GPT-5.6 Terra Pro accepts 1.1M tokens versus 1M.

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: GPT-5.6 Terra Pro Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Gemini 3 Series Family (5 models)

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

No shared data

No shared data

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)

Share card

CompareLLM Matrix

Gemini 3 Flash

OpenAI: GPT-5.6 Terra Pro

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Gemini 3 Series Family (5 models)

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

No shared data

No shared data

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)

Share card

CompareLLM Matrix

Gemini 3 Flash

OpenAI: GPT-5.6 Terra Pro

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons