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GPT-5.5 vs Grok 4.3

Compare GPT-5.5 and Grok 4.3 by pricing, context window, modalities, reasoning support, tool calling, and release details, knowledge cutoff and more.

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GPT-5.5
Grok 4.3
Name
GPT-5.5
Grok 4.3
Provider
OpenAI
xAI
Family
gpt
grok
Model ID
gpt-5.5
grok-4.3
Status
—
—
Released
Apr 23, 2026
Apr 17, 2026
Last updated
Apr 23, 2026
Apr 17, 2026
Context
1,050,000
1,000,000
Input limit
922,000
—
Output limit
128,000
30,000
Input types
text, image, pdf
text, image, 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
—
Cache read
$0.50
$0.20
Cache write
—
—
Input
$5.00
$1.25
Input audio
—
—
Output
$30.00
$2.50
Output audio
—
—
200k+ cache read
$1.00
$0.40
200k+ cache write
—
—
200k+ input
$10.00
$2.50
200k+ output
$45.00
$5.00
Reasoning cost
—
—
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