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GPT-5.5
gpt-5.5 is available for chat, coding, reasoning, and agent workflows. PoYo meters input at 600 credits per 1M tokens and output at 3600 credits per 1M tokens.
gpt-5.5
Chat
Model:
GPT-5.5 API supports chat and coding for production assistants, coding agents, support tools, and structured reasoning workflows.
Pricing details
Transparent pricing with no hidden fees. Pay as you go.
gpt-5.5Input
PoYo price
$3.00/1M tokens
600 credits
Official price
$5.00/1M tokens
Official
You save
40%
gpt-5.5Output
PoYo price
$18.00/1M tokens
3600 credits
Official price
$30.00/1M tokens
Official
You save
40%
| Model | Spec | PoYo price | Official price | You save |
|---|---|---|---|---|
| gpt-5.5 | Input | $3.00/1M tokens 600 credits /1M tokens | $5.00/1M tokens Official | 40% |
Output | $18.00/1M tokens 3600 credits /1M tokens | $30.00/1M tokens Official | 40% |
* Actual fees are based on the final output.
Introduction
Complete guide to using GPT-5.5 API for complex coding and high-value agents
GPT-5.5 API for complex coding and high-value agents
Run GPT-5.5 on PoYo when a request needs the strongest GPT layer: hard coding tasks, long professional reasoning, and tool-heavy agent workflows. Use /v1/chat/completions for existing chat clients or /v1/responses for newer reasoning and tool flows.
Available GPT-5.5 API model on PoYo
Key features of GPT-5.5 API
GPT-5.5 should be reserved for the work where extra reasoning depth, long context, and tool execution quality matter more than raw request volume.
01
Flagship GPT layer for difficult work
Use GPT-5.5 as the upgrade route for codebase analysis, architecture review, multi-step planning, and tasks where weaker models usually need retries.
- High-difficulty coding and reasoning
- Best fit for expensive user actions
- Clear escalation model above GPT-5.4
02
1M context with 128K output
The large context and long output budget fit repository-scale prompts, detailed specifications, and multi-file implementation plans without forcing early summarization.
- 1M context window
- 128K maximum output
- Long-form technical answers
03
Responses API for tool-using agents
GPT-5.5 pairs well with Responses payloads when your application needs reasoning state, structured tool calls, and clearer agent orchestration.
- /v1/responses for agent workflows
- /v1/chat/completions for compatibility
- Same PoYo key and usage tracking
04
Use it as an escalation route
Keep routine traffic on cheaper GPT models and route only complex, high-value requests to GPT-5.5 for better cost control.
- Selective model routing
- Good for premium tiers
- 40% below official pricing on PoYo
Best GPT-5.5 API use cases
01
Large codebase refactor agents
Ask GPT-5.5 to reason over repository context, migration goals, test failures, and staged implementation plans.
02
Multi-tool business agents
Use Responses workflows for agents that combine search, files, function calls, and structured outputs.
03
High-value professional analysis
Send legal, financial, product, or technical briefs when answer quality is worth the higher model tier.
04
Premium fallback routing
Escalate requests from GPT-5.4 or GPT-5.2 when confidence, complexity, or user tier requires a stronger model.
GPT-5.5 API model comparison
Choose by model generation, context window, latency profile, and token budget. PoYo keeps endpoint and billing workflows consistent across these chat models.
| Feature | GPT-5.5 | GPT-5.4 | GPT-5.2 | Gemini 3.5 Flash |
|---|---|---|---|---|
| Provider | OpenAI | OpenAI | OpenAI | |
| Endpoint support | Chat + Responses | Chat + Responses | Chat + Responses | Chat + Gemini Native |
| Context window | 1M | 1M | 400K | 1M |
| Max output | 128K | 128K | 128K | 64K |
| PoYo input price | $3.00 / 1M | $1.05 / 1M | $0.44 / 1M | $0.90 / 1M |
| PoYo output price | $18.00 / 1M | $8.40 / 1M | $3.50 / 1M | $5.40 / 1M |
| Best fit | Hard coding, planning, tool-heavy agents, and high-value professional reasoning. | Cost-aware GPT agents | Stable previous frontier GPT | Fast multimodal agents |
Model capabilities are summarized from official public documentation checked on May 21, 2026. PoYo prices are credit-based.
How to use GPT-5.5 API on PoYo
Step 1: Create a PoYo API key
Open the dashboard, generate an API key, and add credits for chat usage.
Create API Key
Step 2: Pick Chat Completions or Responses
Use /v1/chat/completions for existing OpenAI-compatible chat apps. Use /v1/responses for reasoning controls, tools, and newer response items.
Step 3: Send a requestcurl --request POST \
--url https://api.poyo.ai/v1/responses \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"model": "gpt-5.5",
"input": "Design a test plan for a billing migration.",
"reasoning": {"effort": "medium"}
}'
View chat API docs
GPT-5.5 API pricing on PoYo
| Meter | PoYo credits | USD equivalent |
|---|---|---|
| GPT-5.5 input | 600 credits / 1M tokens | $3.00 / 1M tokens |
| GPT-5.5 output | 3600 credits / 1M tokens | $18.00 / 1M tokens |
PoYo pricing is positioned about 40% cheaper than official pricing. No subscription fees. Use one API key, dashboard usage tracking, and pay-as-you-go credits.
Frequently asked questions about GPT-5.5 API
What is GPT-5.5 best for?
Hard coding, planning, tool-heavy agents, and high-value professional reasoning.
Which endpoints does PoYo support for GPT-5.5?
PoYo supports /v1/chat/completions and /v1/responses for GPT chat models.
How much does GPT-5.5 cost on PoYo?
GPT-5.5 costs 600 credits per 1M input tokens and 3600 credits per 1M output tokens, equivalent to $3.00 input and $18.00 output per 1M tokens.
Can I test it before integrating?
Yes. The model page includes a playground for signed-in users, so you can test prompts and endpoint behavior before moving the model ID into production.
Why use PoYo for GPT-5.5 API access
01
Built for escalation routing
Keep GPT-5.5 for the requests that need the flagship GPT layer instead of paying flagship prices for every message.
02
Chat and Responses support
Use the same model through /v1/chat/completions or /v1/responses depending on how modern your client is.
03
Flagship model with usage pricing
PoYo lists GPT-5.5 at 600 input credits and 3600 output credits per 1M tokens, about 40% below official pricing.
04
Validate before production
Compare prompts in the playground, inspect usage, then move the same model ID into your production client.