GPT-5.5
GPT-5.5Alternatives?
CheaperGPT-6 Astrahigh+8%-35%$1.73Monitoring can return HTTP 403+2BetterGPT-6.1 Sollow+4%-95%$0.13Remove unsupported parameters+5
OpenMuse Spark Openxhigh+1%-68%$0.84Context: 1.05M → 1M+2Lower effortSame modelmedium+2%-66%$0.90
CheaperClaude Opus 5.5high+7%-31%$1.82Context: 1.05M → 1M+6GPT-6 Astrahigh+8%-35%$1.73Monitoring can return HTTP 403+2GPT-6.1 Solmax+8%-73%$0.72Remove unsupported parameters+5Claude Opus 5.5high+7%-31%$1.82Context: 1.05M → 1M+6
Gemini 3.8 Flashhigh+7%-53%*$1.24Context: 1.05M → 1M+2GPT-5.6 Solmax+4%-25%$1.99GPT-6.1 Sollow+4%-95%$0.13Remove unsupported parameters+5GPT-6 Solhigh+3%-86%$0.37Claude Opus 5.5low+6%-79%$0.55Context: 1.05M → 1M+6GPT-6 Astralow+6%-69%$0.82Monitoring can return HTTP 403+2Gemini 3.8 Flashmedium+5%-65%*$0.93Context: 1.05M → 1M+2Muse Spark OpenxhighOpen+1%-68%$0.84Context: 1.05M → 1M+2
DeepSeek V4.1 Flash 1017maxOpensame-90%$0.26Context: 1.05M → 1M+5
Kimi K3maxOpensame-24%$2.00Context: 1.05M → 1M+4
Qwen3.8 FlashthinkingOpensame-86%$0.37Context: 1.05M → 262K+6Kimi K2.6thinkingOpensame-70%$0.80Context: 1.05M → 256KGPT-6 Astraxhigh+8%-12%$2.31Monitoring can return HTTP 403+2GPT-6.1 Solxhigh+7%-85%$0.39Remove unsupported parameters+5GPT-5.6 Solxhigh+3%-55%$1.18GPT-6 Solxhigh+3%-80%$0.52GPT-6 Lunaxhighsame-98%$0.042Function calling only with none · Chat Completions+3GPT-5.6 Terraxhighsame-76%$0.63Prompts with >272K input tokensGPT-5.6 Lunaxhigh-2%-97%$0.085GPT-5.3 Codexxhigh-2%—$1.75 / $14Context: 1.05M → 400K+1All OpenAI models →History
17 versionsBenchmarks
in Vision & DocumentsWatch 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 $2.63 at xhigh 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?›
#22 of 334 in Chat & Knowledge, #31 of 132 in Coding, #39 of 133 in Agents & Tool Use, #25 of 195 in Writing & Language, #20 of 124 in Vision & Documents. Strongest at: Coding, Tool calling, Reasoning, Science, Long context, Knowledge, Instructions, Vision.
Is GPT-5.5 better than GPT-5.4?›
On MMMU-Pro (vision), GPT-5.5 scores 81.2 vs 78.4 — 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 Muse Spark Open.
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 Astra (cheaper), GPT-6.1 Sol (better), Muse Spark Open (open weights).