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Gemini 1.5 Flash vs Gemini 3.7 Flash

Comparing Gemini 1.5 Flash and Gemini 3.7 Flash across benchmarks, pricing, and capabilities.

Google · Google · Updated for 2026

Which is better?

Gemini 1.5 Flash and Gemini 3.7 Flash trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Gemini 1.5 Flash is roughly 5.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Gemini 1.5 Flash

  • cost matters — it's about 5.7x cheaper per token

Choose Gemini 3.7 Flash

  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

Gemini 1.5 Flash
Google
Gemini 3.7 Flash
Google
Benchmark wins
—
—
Input price
$0.15 / M
$0.75 / M
Output price
$0.60 / M
$3.75 / M
Context window
1,048,576
1,048,576
Released
May 2024
Aug 2026
License
Proprietary
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 1.5 Flash and Gemini 3.7 Flashdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Flash costs less

For input processing, Gemini 1.5 Flash ($0.15/1M tokens) is 5.0x cheaper than Gemini 3.7 Flash ($0.75/1M tokens).

For output processing, Gemini 1.5 Flash ($0.60/1M tokens) is 6.3x cheaper than Gemini 3.7 Flash ($3.75/1M tokens).

In conclusion, Gemini 3.7 Flash is more expensive than Gemini 1.5 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Aug 24 2026 • llm-stats.com
Google
Gemini 1.5 Flash
Input tokens$0.15
Output tokens$0.60
Best providerGoogle
Google
Gemini 3.7 Flash
Input tokens$0.75
Output tokens$3.75
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,048,576 tokens. Gemini 3.7 Flash can generate longer responses up to 65,536 tokens, while Gemini 1.5 Flash is limited to 8,192 tokens.

Google
Gemini 1.5 Flash
Input1,048,576 tokens
Output8,192 tokens
Google
Gemini 3.7 Flash
Input1,048,576 tokens
Output65,536 tokens
Mon Aug 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 1.5 Flash and Gemini 3.7 Flash support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 1.5 Flash

Text
Images
Audio
Video

Gemini 3.7 Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 1.5 Flash

Proprietary

Closed source

Gemini 3.7 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash was released on 2024-05-01, while Gemini 3.7 Flash was released on 2026-08-13.

Gemini 3.7 Flash is 28 months newer than Gemini 1.5 Flash.

Gemini 1.5 Flash

May 1, 2024

2.3 years ago

Gemini 3.7 Flash

Aug 13, 2026

1 weeks ago

2.3yr newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash has a knowledge cutoff of 2023-11-01, while Gemini 3.7 Flash has a cutoff of 2026-03-31.

Gemini 3.7 Flash has more recent training data (up to 2026-03-31), making it potentially better informed about events through that date compared to Gemini 1.5 Flash (2023-11-01).

Gemini 1.5 Flash

Nov 2023

Gemini 3.7 Flash

Mar 2026

2.3 yr newer

Provider Availability

Gemini 1.5 Flash is available from Google. Gemini 3.7 Flash is available from Google.

Gemini 1.5 Flash

google logo
Google
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M

Gemini 3.7 Flash

google logo
Google
Input Price:Input: $0.75/1MOutput Price:Output: $3.75/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 1.5 Flash and Gemini 3.7 Flash side-by-side, then vote on the output you prefer.

Gemini 1.5 Flash
✓ Preferred
Gemini 3.7 Flash
Open in Playground

FAQ

Common questions about Gemini 1.5 Flash vs Gemini 3.7 Flash.

Which is better, Gemini 1.5 Flash or Gemini 3.7 Flash?

Gemini 1.5 Flash (Google) and Gemini 3.7 Flash (Google) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Gemini 1.5 Flash compare to Gemini 3.7 Flash in benchmarks?

Gemini 1.5 Flash scores XSTest: 97.0%, FLEURS: 90.4%, HellaSwag: 86.5%, GSM8k: 86.2%, BIG-Bench Hard: 85.5%. Gemini 3.7 Flash scores MRCR v2 (8-needle): 97.0%, Harvey LAB-AA: 90.7%, CharXiv-R: 88.7%, Terminal-Bench 2.1: 85.8%, LVBench: 85.4%.

Is Gemini 1.5 Flash cheaper than Gemini 3.7 Flash?

Gemini 1.5 Flash is 5.0x cheaper for input tokens. Gemini 1.5 Flash costs $0.15/M input and $0.60/M output via google. Gemini 3.7 Flash costs $0.75/M input and $3.75/M output via google.

What are the context window sizes for Gemini 1.5 Flash and Gemini 3.7 Flash?

Gemini 1.5 Flash supports 1.0M tokens and Gemini 3.7 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 1.5 Flash and Gemini 3.7 Flash?

Key differences include input pricing ($0.15 vs $0.75/M). See the full comparison above for benchmark-by-benchmark results.

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