OpenAI model
GPT 5.5 2026 04 23
GPT 5.5 2026 04 23 in the public OpenAI catalog.
- Provider
- OpenAI
- Availability
- Available
- Model ID
- gpt-5.5-2026-04-23
- Snapshot
- 2026-10-07
GPT 5.5 2026 04 23 Benchmarks & Agentic Accuracy
Verified primary research & developer preference metrics
What This Means in Real Software Development
- 78.5% on SWE-bench Verified sets a new high-water mark for autonomous repository engineering.
- Multi-modal vision and code synthesis enables end-to-end web application refactoring from UI mocks.
- Operates with high reasoning depth and zero context degradation.
- Unparalleled accuracy in Task Program DAG decomposition and integration barrier validation.
Swarm Multi-Agent Topology
Best Paired With: Gemini 3.8 Flash for subagent implementation
The premier orchestrator for enterprise-scale software engineering tasks.
Supervises multi-agent worktrees and guarantees clean branch integration.
What Developers & Practitioners Are Saying
Real-world field observations, production strengths, and developer consensus
"Refined iteration of the GPT-5 family, optimizing token efficiency and boosting complex multi-step reasoning accuracy."
Verified Real-World Strengths
- 78.5% on SWE-bench Verified
- High throughput with near-frontier reasoning quality
- Exceptional JSON schema and type contract fidelity
Production Caveats & Gaps
- Output tokens can scale quickly on open-ended refactoring prompts
- Still benefits from worktree isolation to catch edge-case regressions
Primary Sources & Methodology Citations
- OpenAI GPT-5.5 Milestone Announcement — OpenAI (April 2026)
GPT 5.5 2026 04 23 model overview
GPT 5.5 2026 04 23 is listed in the public Swarm catalog through OpenAI. This page summarizes the verified catalog fields used by Swarm without claiming real-time access for every provider account.
- Provider
- OpenAI
- Family
- Gpt 5
- Context window
- 1.05M tokens
- Thinking support
- off · low · medium · high · xhigh
- Availability status
- Available
- Catalog ID
- openai/gpt-5.5-2026-04-23
Run GPT 5.5 2026 04 23 in Swarm
Verified CLI workflow & multi-agent architecture
swarm ctl model set --provider openai --model openai/gpt-5.5-2026-04-23# Or switch interactively inside the terminal TUI:
/modelsSubagent Role Matrix
Assign GPT 5.5 2026 04 23 to specialized system roles in ~/.swarm/config.json:
- Primary / Planner: Orchestrates full task DAGs and multi-stage pipelines.
- Coder Subagent: Generates code and unit tests inside private Git worktrees.
- Finder Subagent: Performs read-only code search, symbol discovery, and mapping.
Public catalog snapshot. Catalog availability is not a real-time provider status or an access guarantee.