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GPT-5.5 vs Gemini 3.5 Flash

Compare GPT-5.5 and Gemini 3.5 Flash by pricing, context window, modalities, reasoning support, tool calling, and release details, knowledge cutoff and more.

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GPT-5.5
Gemini 3.5 Flash
Name
GPT-5.5
Gemini 3.5 Flash
Provider
OpenAI
Google
Family
gpt
gemini-flash
Model ID
gpt-5.5
gemini-3.5-flash
Status
—
—
Released
Apr 23, 2026
May 19, 2026
Last updated
Apr 23, 2026
May 19, 2026
Context
1,050,000
1,048,576
Input limit
922,000
—
Output limit
128,000
65,536
Input types
text, image, pdf
text, image, video, audio, pdf
Output types
text
text
Reasoning
Yes
Yes
Tool call
Yes
Yes
Structured output
supported
supported
Temperature
unsupported
supported
Attachment
Yes
Yes
Open weights
No
No
Knowledge
Knowledge cutoff date
2025-12-01
2025-01
Cache read
$0.50
$0.15
Cache write
—
—
Input
$5.00
$1.50
Input audio
—
$1.50
Output
$30.00
$9.00
Output audio
—
—
200k+ cache read
$1.00
—
200k+ cache write
—
—
200k+ input
$10.00
—
200k+ output
$45.00
—
Reasoning cost
—
—
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