Try GPT-5.5 in Cline

Best for

• Agentic coding tasks that combine reasoning, file changes, and tool use
• Analyzing large repositories or specifications with a long context window
• Complex, multi-part work that crosses coding, research, and structured outputs

Limitations

• OpenAI API usage is billed separately from Cline; Codex subscription availability depends on the account and plan.
• Context limits and billing differ between API and Codex subscription access, so confirm the selected provider's limits for long runs.

Set up in Cline

Choose the surface that fits your workflow: use the Cline IDE extensions, run Cline CLI in your terminal or CI, or configure the model in scripts and products with the Cline SDK. Then complete the provider-specific steps below.

1. Sign in to your Cline account in the Cline IDE extension or CLI.
2. Choose Cline (usage-billing) provider, choose OpenAI provider and add your own API key, or choose OpenAI Codex provider with an eligible subscription.
3. Select GPT-5.5 from the model list and provide the task's acceptance criteria and verification commands.

Example tasks

Use these as starting prompts and adapt them to your repository.

1. Task 1: Trace the request lifecycle across this monorepo, identify why retries can duplicate side effects, and implement a regression-tested fix.
2. Task 2: Review this migration plan against the codebase, identify missing compatibility steps, and implement the first independently deployable phase.

Frequently asked questions