How much does Gemini 2.5 Flash cost per 1M tokens?

Gemini 2.5 Flash costs $0.30 per 1M input tokens and $2.50 per 1M output tokens, and $0.03 per 1M cached input tokens on Google’s standard tier.

How much does Gemini 3.5 Flash cost per 1M tokens?

Gemini 3.5 Flash costs $1.50 per 1M input tokens and $9.00 per 1M output tokens, and $0.15 per 1M cached input tokens on Google’s standard tier.

Which has the larger context window, Gemini 2.5 Flash or Gemini 3.5 Flash?

Both offer a 1.05M-token context window.

Gemini 2.5 Flash vs Gemini 3.5 Flash: pricing and benchmarks

Gemini 2.5 Flash is 80% cheaper on input tokens ($0.30 vs $1.50 per 1M). Gemini 2.5 Flash is 72% cheaper on output tokens ($2.50 vs $9.00 per 1M). On our document Q&A workload (50,000 questions a month), Gemini 2.5 Flash costs $195.00 a month versus $870.00 for Gemini 3.5 Flash, 78% less. Gemini 3.5 Flash scores 154.7 on the Epoch Capabilities Index vs 140.5 for Gemini 2.5 Flash.

Prices verified September 14, 2026.

Which should you choose?

Overall capability

Gemini 3.5 Flash

Gemini 3.5 Flash scores 154.7 on the Epoch Capabilities Index vs 140.5 for Gemini 2.5 Flash.

Price

Gemini 2.5 Flash

Gemini 2.5 Flash costs $0.85 per 1M tokens (3:1 input-to-output mix) vs $3.375 for Gemini 3.5 Flash, 75% less.

Best value

Too close to call

A trade-off: Gemini 3.5 Flash is 14.2 ECI points more capable but costs 4.0x as much as Gemini 2.5 Flash.

Pricing and specs

	Gemini 2.5 Flash	Gemini 3.5 Flash
Provider	Google	Google
API model ID	gemini-2.5-flash	gemini-3.5-flash
Input / 1M tokens	$0.30	$1.50
Cached input / 1M tokens	$0.03	$0.15
Output / 1M tokens	$2.50	$9.00
Long-context rates	—	—
Context window	1.05M tokens	1.05M tokens
Max output	66K tokens	66K tokens
Batch discount	—	50% off

Benchmarks

	Gemini 2.5 Flash	Gemini 3.5 Flash
Epoch Capabilities Index	140.5	154.7
GPQA Diamond· Science reasoning	—	90.4%
FrontierMath (Tiers 1–3)· Advanced math	—	62.8%
SimpleQA Verified· Factual accuracy	—	66.2%
ARC-AGI-2· Abstract reasoning	—	72.1%
DeepSWE· Coding	—	37.4%
APEX-Agents· Agentic work	1.8%	—

Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks

Monthly cost for real workloads

Workload	Gemini 2.5 Flash	Gemini 3.5 Flash	Difference
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each.	$145.00	$585.00	Gemini 2.5 Flash 75% cheaper
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each.	$195.00	$870.00	Gemini 2.5 Flash 78% cheaper
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens.	$94.40	$402.00	Gemini 2.5 Flash 77% cheaper

Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.

Gemini 2.5 Flash vs Gemini 3.5 Flash cost calculator

Requests per monthInput tokens / requestOutput tokens / requestCached input: 0%

Gemini 2.5 FlashGoogleCheapest
$195.00/mo
$0.0039 / request
Gemini 3.5 FlashGoogle
$870.00/mo
$0.02 / request

Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.

Gemini 2.5 Flash pricing notes

Google’s previous-generation Flash model.

Audio input costs $1.00 per 1M tokens; text, image and video cost $0.30.
Output price includes thinking tokens.

Google official pricing ↗

Gemini 3.5 Flash pricing notes

Google’s Gemini 3.5 Flash model, with thinking, tool use and a 1M-token context window.

Output price includes thinking tokens.
Context cache storage costs $1.00 per 1M tokens per hour.
Priority inference costs 1.8x the standard rate.