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GPT-5.5 vs Claude Opus 4.8

Compare GPT-5.5 and Claude Opus 4.8 by pricing, context window, modalities, reasoning support, tool calling, and release details, knowledge cutoff and more.

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GPT-5.5
Claude Opus 4.8
Name
GPT-5.5
Claude Opus 4.8
Provider
OpenAI
Anthropic
Family
gpt
claude-opus
Model ID
gpt-5.5
claude-opus-4-8
Status
—
—
Released
Apr 23, 2026
May 28, 2026
Last updated
Apr 23, 2026
May 28, 2026
Context
1,050,000
1,000,000
Input limit
922,000
—
Output limit
128,000
128,000
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
unsupported
Attachment
Yes
Yes
Open weights
No
No
Knowledge
Knowledge cutoff date
2025-12-01
2026-01
Cache read
$0.50
$0.50
Cache write
—
$6.25
Input
$5.00
$5.00
Input audio
—
—
Output
$30.00
$25.00
Output audio
—
—
200k+ cache read
$1.00
—
200k+ cache write
—
—
200k+ input
$10.00
—
200k+ output
$45.00
—
Reasoning cost
—
—
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