Migrating from gemini-3.1-flash-lite to gemini-3.5-flash-lite

What changes when you move from gemini-3.1-flash-lite to gemini-3.5-flash-lite: input price +20%, output price +66.7%.

From: gemini-3.1-flash-lite
Status: Deprecated
Shutdown: May 7, 2027 at the earliest
Time left: 204 days

To: gemini-3.5-flash-lite
Status: Active
Shutdown: none announced
Time left: —

Prices

USD per 1M tokens, standard tier

Type	gemini-3.1-flash-lite	gemini-3.5-flash-lite	Change
Input	$0.25first seen October 1, 2026 · source	$0.30first seen October 1, 2026 · source	+20%
Cached input	$0.025first seen October 1, 2026 · source	$0.03first seen October 1, 2026 · source	+20%
Output	$1.50first seen October 1, 2026 · source	$2.50first seen October 1, 2026 · source	+66.7%

At 1M input and 250K output tokens a month: $0.625 on gemini-3.1-flash-lite, $0.925 on gemini-3.5-flash-lite (+48%).

Other tiers, prompt-size bands and modalities are on each model's page.

Limits

Tokens

Limit	gemini-3.1-flash-lite	gemini-3.5-flash-lite	Change
Context window	1,048,576 tokensin place when tracking began (October 6, 2026) · source	1,048,576 tokensin place when tracking began (October 6, 2026) · source	0%
Max output tokens	65,536 tokensin place when tracking began (October 6, 2026) · source	65,536 tokensin place when tracking began (October 6, 2026) · source	0%

Benchmarks

Same benchmark, source and setting on both sides

Benchmark	gemini-3.1-flash-lite	gemini-3.5-flash-lite	Change
FrontierMath Tiers 1-3Epoch AI, high effort.	27.7%	26.0%	−1.7 pts
GPQA DiamondEpoch AI, high effort. Other settings 74.2% → 75.8% low effort 73.7% → 74.2% minimal effort	81.8%	83.3%	+1.5 pts
OTIS Mock AIME 2024-2025Epoch AI, high effort. Other settings 44.4% → 60.0% low effort 37.8% → 51.1% minimal effort	80.0%	71.1%	−8.9 pts

A score from one source is never compared with another source's, and company-reported scores are compared only within the same company; settings named where they differ. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.

Features and parameters

Compare models

Same on both

Structured outputs: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
Function calling: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
Prompt caching: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
Batch API: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
Image input: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
PDF input: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
Reasoning / thinking: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source
Built-in web search: supported on both.gemini-3.1-flash-lite: in place when tracking began (October 6, 2026) · source · gemini-3.5-flash-lite: in place when tracking began (October 6, 2026) · source

Not published for gemini-3.1-flash-lite: Fine-tuning, temperature parameter, top_p parameter, logprobs.

Not published for gemini-3.5-flash-lite: Fine-tuning, temperature parameter, top_p parameter, logprobs.

Free tier

gemini-3.1-flash-lite: Free tier, in place when tracking began (October 7, 2026) (source)

gemini-3.5-flash-lite: Free tier, in place when tracking began (October 7, 2026) (source) · All free models

Aliases

All aliases

No aliases point at either model.

On cloud platforms

All platform dates

Model	Platform	Platform ID	Shutdown	Time left
gemini-3.1-flash-lite	Google Cloud Vertex AI	gemini-3.1-flash-lite	not before May 7, 2027Active
gemini-3.5-flash-lite	Google Cloud Vertex AI	gemini-3.5-flash-lite	not before Jul 21, 2027Active

Read daily from each platform's own pages. The status above uses each company's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.

Checklist

Change the model string from gemini-3.1-flash-lite to gemini-3.5-flash-lite.
Re-check costs: gemini-3.5-flash-lite costs more than gemini-3.1-flash-lite (input +20%, output +66.7%).

Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: gemini-3.1-flash-lite, gemini-3.5-flash-lite.