OpenAI: GPT-5.5
The OpenAI GPT-5.5 is an AI model that can process text, image, and file inputs with a maximum context length of 1,050,000 characters. It supports tools and reasoning capabilities, but does not provide structured output. This model may be suitable for those who need to integrate multiple input modalities or require significant context understanding. Its blended benchmark score of 85.8 across four independent benchmarks suggests it performs well in a variety of tasks. Considering its price point of $5/M input tokens and $30/M output tokens, users with high data volume needs may find it cost-effective, especially if they prioritize versatility over specialized performance.
Benchmark results
Independent, published benchmarks. Blended score 85.8 across 4 benchmarks, last refreshed 2026-09-07. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 75.3 |
| AI Index Coding | software engineering tasks | 100.0 |
| AI Index Agentic | multi-step tool-using tasks | 61.9 |
| EQ-Bench | emotional understanding in dialogue | 82.4 |
- Model ID
- openai/gpt-5.5
- Vendor
- openai
- Released
- April 2026
- Tokenizer
- GPT
- Input Modalities
- file, image, text
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $5.00/M input and $30.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.20 |
| Classify 1,000 customer emails | 500k in / 50k out | $4.00 |
| A month of a busy support chatbot | 5M in / 2M out | $85.00 |
Category rankings
Where OpenAI: GPT-5.5 places across the 17 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #15 | Legal ResearchProfessional · of 25 ranked | 168 |
| #15 | Contract ReviewProfessional · of 25 ranked | 177 |
| #15 | Scientific ResearchProfessional · of 25 ranked | 168 |
| #15 | Fiction CollaboratorPersonal · of 25 ranked | 168 |
| #15 | Literature ReviewResearch · of 25 ranked | 168 |
| #17 | Code RefactoringCode · of 25 ranked | 164 |
| #17 | RAG PipelinesAgents · of 25 ranked | 164 |
| #17 | Long-Context Q&AAgents · of 25 ranked | 155 |
| #20 | Creative WritingWriting · of 25 ranked | 156 |
| #20 | Screenwriting & DialogWriting · of 25 ranked | 156 |
| #20 | Academic WritingWriting · of 25 ranked | 156 |
| #20 | Legal DraftingProfessional · of 25 ranked | 156 |
| #20 | RFP ResponseBusiness · of 25 ranked | 174 |
| #20 | OKRs & Strategic PlanningBusiness · of 25 ranked | 156 |
| #20 | Math ProofsResearch · of 25 ranked | 156 |
| #23 | Code ReviewCode · of 25 ranked | 165 |
| #23 | Essay GradingEducation · of 25 ranked | 165 |
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Quick answers
- How much does OpenAI: GPT-5.5 cost?
- $5.00 per million input tokens and $30.00 per million output tokens.
- What is OpenAI: GPT-5.5's context window?
- 1,050,000 tokens, roughly 1,575 pages of text in a single request.
- Does OpenAI: GPT-5.5 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-5.5 process images?
- Yes, it accepts image input.