GPT-5.5 vs GPT-5.5 Pro
GPT-5.5 (2026) and GPT-5.5 Pro (2026) are frontier-tier reasoning models from OpenAI. GPT-5.5 ships a 1.05m-token context window, while GPT-5.5 Pro ships a 1.05m-token context window. On SWE-bench Verified, GPT-5.5 and GPT-5.5 Pro are tied at 82.6. On pricing, GPT-5.5 ranges from $5 to $8/1M input tokens by tier; GPT-5.5 Pro costs $30/1M input tokens. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-5.5 is safer overall; choose GPT-5.5 Pro when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1.05m | 1.05m |
| Cheapest output | $30/1M tokens | $180/1M tokens |
| Provider routes | 4 tracked | 3 tracked |
| Shared benchmarks | 9 shared | GDPval-AA leader |
Decision tradeoffs
- GPT-5.5 has the lower cheapest tracked output price at $30/1M tokens.
- GPT-5.5 has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags GPT-5.5 for Coding, RAG, and Agents.
- GPT-5.5 Pro holds a shared-benchmark lead on GDPval-AA, ahead by 16 points.
- Local decision data tags GPT-5.5 Pro 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-5.5
$11,500
Cheapest tracked route/tier: OpenAI API 0-272K input tokens
GPT-5.5 Pro
$69,000
Cheapest tracked route/tier: OpenAI API <=272K tokens (standard)
Estimated monthly gap: $57,500. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenAI API, OpenRouter, and Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.5 Pro is $150/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Provider overlap exists on OpenAI API, OpenRouter, and Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.5 is $150/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-23 | 2026-04-23 |
| Context window | 1.05m | 1.05m |
| 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 | 2025-12 | 2025-12 |
Pricing and availability
| Pricing attribute | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| Input price |
| $30/1M tokens |
| Output price |
| $180/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| SWE-bench Verified | 82.6 | 82.6 |
| SWE-bench Pro | 58.6 | 58.6 |
| Google-Proof Q&A | 93.6 | 93.6 |
| Terminal-Bench 2.1 | 78.2 | 78.2 |
| OSWorld-Verified | 78.7 | 78.7 |
| GDPval-AA | 1769.0 | 1785.0 |
| GeneBench-Pro | 12.0 | 20.5 |
| Terminal-Bench 2.0 | 82.7 | 82.7 |
| MCP-Atlas | 75.3 | 75.3 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has GPT-5.5 and GPT-5.5 Pro tied at 82.6; SWE-bench Pro has GPT-5.5 and GPT-5.5 Pro tied at 58.6; Google-Proof Q&A has GPT-5.5 and GPT-5.5 Pro tied at 93.6. The visible top rows are tied, so treat the table as parity evidence until a benchmark that mirrors your workload separates the models. Provider routing, prompt style, and tool access can still move real application results.
The capability footprint is close: both models cover vision, multimodal input, reasoning mode, function calling, and tool use. That makes context budget, benchmark fit, and provider maturity more important than a simple checklist. If your application depends on one integration detail, verify it against the provider route you plan to use, not just the base model listing.
For cost, GPT-5.5 lists tiered pricing: 0-272K input tokens is $5/1M input and $30/1M output; 272K+ input tokens is $8/1M input and $36/1M output, while GPT-5.5 Pro lists $30/1M input and $180/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-5.5 lower by about $62.50 per million blended tokens. For tiered rows, this cheapest-track view can understate interactive or fast-lane spend, so compare the tier you will actually use. Availability is 4 providers versus 3, so concentration risk also matters.
Choose GPT-5.5 when coding workflow support, lower cheapest-tier input-token cost, and broader provider choice are central to the workload. Choose GPT-5.5 Pro when coding workflow support are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, GPT-5.5 or GPT-5.5 Pro?
GPT-5.5 supports 1.05m tokens, while GPT-5.5 Pro supports 1.05m tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is cheaper, GPT-5.5 or GPT-5.5 Pro?
GPT-5.5 lists tiered pricing: 0-272K input tokens is $5/1M input and $30/1M output; 272K+ input tokens is $8/1M input and $36/1M output. GPT-5.5 Pro lists $30/1M input and $180/1M output tokens on the cheapest tracked provider. Compare the tier you will actually use; cheap async pricing can overstate savings for interactive workflows. Provider discounts or batch pricing can still change the final bill.
Is GPT-5.5 or GPT-5.5 Pro open source?
GPT-5.5 is listed under Proprietary. GPT-5.5 Pro is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, GPT-5.5 or GPT-5.5 Pro?
Both GPT-5.5 and GPT-5.5 Pro expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, GPT-5.5 or GPT-5.5 Pro?
Both GPT-5.5 and GPT-5.5 Pro expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run GPT-5.5 and GPT-5.5 Pro?
GPT-5.5 is available on OpenAI API, OpenRouter, Vercel AI Gateway, and AWS Bedrock. GPT-5.5 Pro is available on OpenAI API, OpenRouter, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.