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Home/Gemini 3.5 Flash vs Gemini 3.1 Flash
Winner: Gemini 3.5 FlashGoogle model comparison

Gemini 3.5 Flash vs Gemini 3.1 Flash

Gemini 3.5 Flash wins on coding (90 vs 68) and writing quality. Gemini 3.1 Flash wins on price ($0.5 vs $1.5/1M input). For most workflows, Gemini 3.5 Flash is the stronger default — excellent fast agentic model, superseded by gemini 3.6 flash.

Last verified Aug 6, 2026/Model data modified Aug 6, 2026
Rankings refresh dailyScored on 6 criteriaNo paid rankings
GoogleBalanced
Input cost
$1.50/1M
Context
1.0M tokens
Speed
Fast

Clear recommendation block

The shortest way to see the safest default, the lower-cost option, and the specialist pick before you read deeper.

Best overall model

Gemini 3.5 Flash

View
Why this recommendation

Gemini 3.5 Flash is the safest overall answer here when you want the strongest default instead of the lowest list price.

GoogleBalanced
Best for
Fast agentic coding and autonomous task execution
Price
$1.50/1M
Context
1.0M tokens
Best budget model

Mistral: Mistral Nemo

View
Why this recommendation

Mistral: Mistral Nemo is the lower-cost option to start with when you still need useful output at scale.

MistralBudget
Best for
Teams needing a cheap, fast, multilingual workhorse for classification, summarization, or light coding tasks at scale.
Price
$0.02/1M
Context
131k tokens
Best for speed

Gemini 3.1 Flash

View
Why this recommendation

Gemini 3.1 Flash is the better pick when response speed matters more than maximum reasoning depth.

GoogleBudget
Best for
High-volume everyday AI usage where speed and cost both matter
Price
$0.50/1M
Context
1M tokens

Why this page recommends it

Gemini 3.5 Flash leads on coding with a score of 90 vs 68 for Gemini 3.1 Flash.

Gemini 3.5 Flash has the larger context window: 1.048576M vs 1M for Gemini 3.1 Flash.

Gemini 3.1 Flash is cheaper at $0.5/1M input tokens vs $1.5/1M for Gemini 3.5 Flash.

Decision notes

Choose Gemini 3.5 Flash for coding and research — fast agentic coding and autonomous task execution.

Choose Gemini 3.1 Flash when high-volume everyday ai usage where speed and cost both matter.

Gemini 3.1 Flash is the more cost-efficient option at $0.5/1M — worth considering if token volume is a concern.

Interactive decision lab

Test the recommendation against your priority

Switch the scoring lens to see whether the top answer changes when you care more about cost, speed, or long-document work.

#1Gemini 3.5 Flash86 pts
#2Gemini 3.1 Flash77 pts
Quality first

Gemini 3.5 Flash

Google / Balanced / Aug 6, 2026

86

Excellent fast agentic model, superseded by Gemini 3.6 Flash.

Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.

Cost
$1.50/1M
$9.00/1M out
Speed
Fast
4/100 score
Context
1.0M tokens
input window
View model
Data-backed recommendation
Avoid this pick if

Starting fresh — Gemini 3.6 Flash is better and cheaper.

Recommended comparisons

The fastest way to see where the recommendation shifts when your priority changes.

GoogleBalancedWinner: Gemini 3.5 Flash

Gemini 3.5 Flash

Excellent fast agentic model, superseded by Gemini 3.6 Flash.

Best use case
Fast agentic coding and autonomous task execution
Input
$1.50/1M
Pricing
Balanced
Speed
Fast
Context
1.0M tokens
AgenticFastMultimodal
GoogleBudgetOption 2

Gemini 3.1 Flash

Best cheap AI for broad day-to-day work — now with 1M context.

Best use case
High-volume everyday AI usage where speed and cost both matter
Input
$0.50/1M
Pricing
Budget
Speed
Very fast
Context
1M tokens
Best budgetFast1M context

Pros

Outperforms Gemini 3.1 Pro on agentic/coding benchmarks despite being the Flash tier

Frontier intelligence at ~278 output tokens/sec — about 4x faster than comparable models

Strong reasoning: ARC-AGI-2 72.1%, CharXiv Reasoning 84.2%, GDPval-AA 1656 Elo

Cons

Superseded two months later by Gemini 3.6 Flash — better scores and cheaper output

No Pro-tier sibling shipped: Gemini 3.5 Pro remains delayed, leaving 3.1 Pro as the Pro flagship

Explore related decisions

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Comparison
Claude Opus 4.7 vs Gemini 3.1 FlashClaude Opus 4.7 vs Gemini 3.1 Flash — see exactly which wins on SWE-bench coding, price per 1M tokens, context window, and speed, with a clear verdict for…Read guide
Comparison
GPT-4o vs Gemini 3.1 FlashGPT-4o vs Gemini 3.1 Flash — see exactly which wins on SWE-bench coding, price per 1M tokens, context window, and speed, with a clear verdict for every use…Read guide
Google
Gemini 3.5 FlashExcellent fast agentic model, superseded by Gemini 3.6 Flash.Read guide
Google
Gemini 3.1 FlashBest cheap AI for broad day-to-day work — now with 1M context.Read guide
Alternatives
Best Gemini 3.5 Flash AlternativesLooking for a Gemini 3.5 Flash alternative? Compare 4 rivals on real capability scores, price per 1M tokens, and context size — including cheaper and…Read guide
Alternatives
Best Gemini 3.1 Flash AlternativesLooking for a Gemini 3.1 Flash alternative? Compare 4 rivals on real capability scores, price per 1M tokens, and context size — including cheaper and…Read guide
Guide
Best AI for CodingClaude Opus 4.7 leads coding AI in 2026 with 64.3% on SWE-Bench Pro. Compare it to GPT-5.5, Claude Sonnet 4.6, and budget picks like DeepSeek V3 for your stack.Read guide

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FAQ

Is Gemini 3.5 Flash better than Gemini 3.1 Flash?

Gemini 3.5 Flash wins on more categories — coding, research, reasoning. Gemini 3.1 Flash is the better pick when high-volume everyday ai usage where speed and cost both matter. The right choice depends on your specific use case.

Which is cheaper — Gemini 3.5 Flash or Gemini 3.1 Flash?

Gemini 3.1 Flash is cheaper at $0.5/1M input and $3/1M output. Gemini 3.5 Flash costs $1.5/1M input and $9/1M output.

Which has a larger context window — Gemini 3.5 Flash or Gemini 3.1 Flash?

Gemini 3.5 Flash has the larger context window at 1.048576M tokens vs Gemini 3.1 Flash's 1M. For large document analysis, Gemini 3.5 Flash is the stronger pick.

Is Gemini 3.5 Flash or Gemini 3.1 Flash better for coding?

Gemini 3.5 Flash is better for coding with a score of 90 vs Gemini 3.1 Flash's 68 (out of 100). Claude Fable 5 is the overall coding leader in this directory at 100/100.

Which is faster — Gemini 3.5 Flash or Gemini 3.1 Flash?

Gemini 3.1 Flash is faster with a very fast speed rating (score: 5) vs Gemini 3.5 Flash's fast rating (score: 4).