Model Comparison

Gemini 3 Flash vs GPT-5.3 ChatWhich is better in 2026?

Comparing Gemini 3 Flash and GPT-5.3 Chat across benchmarks, pricing, and capabilities.

Verdict: Gemini 3 Flash vs GPT-5.3 Chat — which is better?

Gemini 3 Flash (by Google) and GPT-5.3 Chat (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

On price, Gemini 3 Flash is roughly 4.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 3 Flash also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 3 Flash if…

  • cost matters — it's about 4.3x cheaper per token
  • you process long inputs — it offers a 1,000,000 token context window

Choose GPT-5.3 Chat if…

  • you want the most recent training data — it shipped Mar 2026
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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3 Flash and GPT-5.3 Chatdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3 Flash costs less

For input processing, Gemini 3 Flash ($0.50/1M tokens) is 3.5x cheaper than GPT-5.3 Chat ($1.75/1M tokens).

For output processing, Gemini 3 Flash ($3.00/1M tokens) is 4.7x cheaper than GPT-5.3 Chat ($14.00/1M tokens).

In conclusion, GPT-5.3 Chat is more expensive than Gemini 3 Flash.*

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

Lowest available price from all providers
Mon Jun 15 2026 • llm-stats.com
Google
Gemini 3 Flash
Input tokens$0.50
Output tokens$3.00
Best providerGoogle
OpenAI
GPT-5.3 Chat
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3 Flash accepts 1,000,000 input tokens compared to GPT-5.3 Chat's 128,000 tokens. Gemini 3 Flash can generate longer responses up to 65,536 tokens, while GPT-5.3 Chat is limited to 16,384 tokens.

Google
Gemini 3 Flash
Input1,000,000 tokens
Output65,536 tokens
OpenAI
GPT-5.3 Chat
Input128,000 tokens
Output16,384 tokens
Mon Jun 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Flash and GPT-5.3 Chat support multimodal inputs.

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

Gemini 3 Flash

Text
Images
Audio
Video

GPT-5.3 Chat

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 3 Flash

Proprietary

Closed source

GPT-5.3 Chat

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Flash was released on 2025-12-17, while GPT-5.3 Chat was released on 2026-03-04.

GPT-5.3 Chat is 3 months newer than Gemini 3 Flash.

Gemini 3 Flash

Dec 17, 2025

6 months ago

GPT-5.3 Chat

Mar 4, 2026

3 months ago

2mo newer

Knowledge Cutoff

When training data ends

Gemini 3 Flash has a knowledge cutoff of 2025-01-31, while GPT-5.3 Chat has a cutoff of 2025-08-31.

GPT-5.3 Chat has more recent training data (up to 2025-08-31), making it potentially better informed about events through that date compared to Gemini 3 Flash (2025-01-31).

Gemini 3 Flash

Jan 2025

GPT-5.3 Chat

Aug 2025

7 mo newer

Provider Availability

Gemini 3 Flash is available from Google. GPT-5.3 Chat is available from OpenAI.

Gemini 3 Flash

google logo
Google
Input Price:Input: $0.50/1MOutput Price:Output: $3.00/1M

GPT-5.3 Chat

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,000,000 tokens)
Less expensive input tokens
Less expensive output tokens
OpenAI

No standout differentiators in the data we have for this pair.

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3 Flash
OpenAI
GPT-5.3 Chat

FAQ

Common questions about Gemini 3 Flash vs GPT-5.3 Chat.

Which is better, Gemini 3 Flash or GPT-5.3 Chat?

Gemini 3 Flash (Google) and GPT-5.3 Chat (OpenAI) 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 3 Flash compare to GPT-5.3 Chat in benchmarks?

Gemini 3 Flash scores Vending-Bench 2: 100.0%, AIME 2025: 99.7%, Global PIQA: 92.8%, MMMLU: 91.8%, GPQA: 90.4%. GPT-5.3 Chat scores HealthBench: 54.1%, HealthBench Hard: 25.9%.

Is Gemini 3 Flash cheaper than GPT-5.3 Chat?

Gemini 3 Flash is 3.5x cheaper for input tokens. Gemini 3 Flash costs $0.50/M input and $3.00/M output via google. GPT-5.3 Chat costs $1.75/M input and $14.00/M output via openai.

What are the context window sizes for Gemini 3 Flash and GPT-5.3 Chat?

Gemini 3 Flash supports 1.0M tokens and GPT-5.3 Chat supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3 Flash and GPT-5.3 Chat?

Key differences include context window (1.0M vs 128K), input pricing ($0.50 vs $1.75/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3 Flash and GPT-5.3 Chat?

Gemini 3 Flash is developed by Google and GPT-5.3 Chat is developed by OpenAI.

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