GPT-5.4-Cyber vs GPT-5.5 Instant
GPT-5.4-Cyber (2026) and GPT-5.5 Instant (2026) are frontier reasoning models from OpenAI. GPT-5.4-Cyber ships a not-yet-sourced context window, while GPT-5.5 Instant ships a 400k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing. The goal is to make the tradeoff clear before deeper testing.
GPT-5.5 Instant is safer overall; choose GPT-5.4-Cyber when reasoning depth matters.
Decision scorecard
Local evidence first| Signal | GPT-5.4-Cyber | GPT-5.5 Instant |
|---|---|---|
| Best for | reasoning-heavy apps and multimodal apps | multimodal apps and tool-calling agents |
| Decision fit | Vision | Coding, RAG, and Agents |
| Context window | — | 400k |
| Cheapest output | - | $30/1M tokens |
| Provider routes | 0 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- GPT-5.4-Cyber uniquely exposes Reasoning in local model data.
- Local decision data tags GPT-5.4-Cyber for Vision.
- GPT-5.5 Instant has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 Instant has broader tracked provider coverage for fallback and route flexibility.
- GPT-5.5 Instant uniquely exposes JSON / Tool use, Structured outputs, and Code execution in local model data.
- Local decision data tags GPT-5.5 Instant for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-5.4-Cyber
Unavailable
No complete token price in local provider data
GPT-5.5 Instant
$11,500
Cheapest tracked route/tier: OpenAI API
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for GPT-5.4-Cyber and GPT-5.5 Instant; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning before moving production traffic.
- GPT-5.5 Instant adds JSON / Tool use, Structured outputs, and Code execution in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.5 Instant and GPT-5.4-Cyber; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for JSON / Tool use, Structured outputs, and Code execution before moving production traffic.
- GPT-5.4-Cyber adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-14 | 2026-05-05 |
| Context window | — | 400k |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-08 | 2025-08 |
Pricing and availability
| Pricing attribute | GPT-5.4-Cyber | GPT-5.5 Instant |
|---|---|---|
| Input price | - | $5/1M tokens |
| Output price | - | $30/1M tokens |
| Providers | - |
Capabilities
| Capability | GPT-5.4-Cyber | GPT-5.5 Instant |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-19. Data sourced from public model cards and provider documentation.