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GPT-5.5 vs DeepSeek V4 Pro

Compare GPT-5.5 and DeepSeek V4 Pro by pricing, context window, modalities, reasoning support, tool calling, and release details, knowledge cutoff and more.

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GPT-5.5
DeepSeek V4 Pro
Name
GPT-5.5
DeepSeek V4 Pro
Provider
OpenAI
DeepSeek
Family
gpt
deepseek-thinking
Model ID
gpt-5.5
deepseek-v4-pro
Status
—
—
Released
Apr 23, 2026
Apr 24, 2026
Last updated
Apr 23, 2026
Apr 24, 2026
Context
1,050,000
1,000,000
Input limit
922,000
—
Output limit
128,000
384,000
Input types
text, image, pdf
text
Output types
text
text
Reasoning
Yes
Yes
Tool call
Yes
Yes
Structured output
supported
supported
Temperature
unsupported
supported
Attachment
Yes
No
Open weights
No
Yes
Knowledge
Knowledge cutoff date
2025-12-01
2025-05
Cache read
$0.50
$0.003625
Cache write
—
—
Input
$5.00
$0.435
Input audio
—
—
Output
$30.00
$0.87
Output audio
—
—
200k+ cache read
$1.00
—
200k+ cache write
—
—
200k+ input
$10.00
—
200k+ output
$45.00
—
Reasoning cost
—
—
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