GPT-5.5
GPT-5.5Alternatives?
CheaperGPT-6.1 Solmax+34%-64%$2 / $10Remove unsupported parameters+5BetterGPT-5.6 Lunaxhigh+5%-91%$0.085
OpenGLM 5.3max+28%+122%$2.01Context: 1.05M → 1M+5
CheaperClaude Opus 5.5max+34%-29%$4 / $20Context: 1.05M → 1M+6CheaperClaude Sonnet 5.5max+31%-64%$2 / $10Context: 1.05M → 1M+6GPT-6.1 Solmax+34%-64%$2 / $10Remove unsupported parameters+5Claude Opus 5.5max+34%-29%$4 / $20Context: 1.05M → 1M+6Claude Sonnet 5.5max+31%-64%$2 / $10Context: 1.05M → 1M+6GPT-6 Solmax+31%-64%$2 / $10GPT-5.6 Solhigh+29%-10%$0.81GPT-5.6 Lunaxhigh+5%-91%$0.085GLM 5.3 FlashmaxOpen+17%-69%$0.28Context: 1.05M → 1M+5GPT-5.6 Solmedium+13%-44%$0.50GPT-5.6 Terraxhigh+11%-30%$0.63Prompts with >272K input tokensGPT-6 Astralow+24%-9%$0.82Monitoring can return HTTP 403+2GLM 5.3maxOpen+28%+122%$2.01Context: 1.05M → 1M+5
Kimi K3maxOpen+27%+122%$2.00Context: 1.05M → 1M+4GLM 5.3 FlashmaxOpen+17%-69%$0.28Context: 1.05M → 1M+5
DeepSeek V4 Pro 0813maxOpen+16%-82%$1.32 / $3.96Context: 1.05M → 1M+6DeepSeek V4.1 Flash 1017maxOpensame-95%$0.30 / $1.20Context: 1.05M → 1M+5GPT-6 Astramedium+35%+71%$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmax+34%—$2 / $10Remove unsupported parameters+5GPT-6 Solmax+31%—$2 / $10GPT-6 Lunamax+24%—$0.10 / $0.50Function calling only with none · Chat Completions+3GPT-5.6 Solmedium+13%-44%$0.50GPT-5.4xhigh-4%—$2.50 / $15GPT-5.6 Terramedium-35%-80%$0.18Prompts with >272K input tokensGPT-5.6 Lunamedium-79%-98%$0.016All OpenAI models →History
17 versionsBenchmarks
in CodingWatch out 1
Prompts with >272K input tokens›
Above 272K input tokens, input costs 2× and output 1.5× for the full session in Standard, Batch and Flex. Source ↗
FAQ
How much does GPT-5.5 cost?›
$5 per 1M input tokens and $30 per 1M output tokens; cached input $0.50 per 1M. A typical benchmark task costs about $0.90 at medium effort.
Is GPT-5.5 free to use?›
There is no free API; the cheapest paid price is $5 per 1M input tokens.
How good is GPT-5.5, and what is it best at?›
#35 of 334 in Chat & Knowledge, #44 of 132 in Coding, #42 of 133 in Agents & Tool Use, #25 of 195 in Writing & Language, #12 of 124 in Vision & Documents. Strongest at: Tool calling, Reasoning, Science, Long context, Knowledge, Instructions, Vision.
Is GPT-5.5 better than GPT-5.4?›
On DeepSWE 1.1, GPT-5.5 scores 67 vs 51.8 — higher.
How can I use GPT-5.5?›
Through the API of Amazon Bedrock, Azure, OpenAI.
What is the context window of GPT-5.5?›
1.05M tokens, with up to 128K output tokens.
When was GPT-5.5 released? Is there a newer version?›
Released 2026-04-23. It has been superseded by GPT-5.6 Sol.
Is GPT-5.5 open source?›
No, GPT-5.5 is a closed model available through an API. The closest open-weights option here is GLM 5.3.
Can GPT-5.5 read images?›
It accepts text and images, PDF files as input.
What is GPT-5.5?›
GPT-5.5 is a closed language model from OpenAI, released Apr 2026, the successor to GPT-5.4.
What are the best alternatives to GPT-5.5?›
GPT-6.1 Sol (cheaper), GPT-5.6 Luna (better), GLM 5.3 (open weights).