GPT-5.3 ChatArchive and alternatives
GPT-5.3 Chat is no longer available on OpenRouter. Explore a current alternative below.
Released March 3, 2026
Specifications
GPT-5.3 Chat at a glance
Context
128K tokens
Max output
16.4K tokens
Input
Text, Image, File
Output
Text
Input price
$1.75 / 1M
Output price
$14.00 / 1M
Krater rank
#41
Capabilities
What it is good at
Catalog capabilities
- Accepts image input
- Generates text responses
- Supports tool calling
- Supports structured outputs
Good for
Compare
Compare GPT-5.3 Chat
GPT-5.3 Chat vs GPT-5.1
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.
Open comparisonGPT-5.3 Chat vs GPT-5.6 Sol
GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series.
Open comparisonGPT-5.3 Chat vs GPT-5.2
GPT-5.2 is the latest frontier-grade model in the GPT-5 series, offering stronger agentic and long context perfomance compared to GPT-5.1.
Open comparisonFAQ
Questions about GPT-5.3 Chat
Clear answers based on the model catalog and Krater access.