GPT-5 vs GPT-5.5
2026 - Pricing, benchmarks, and use case comparison
Quick take
- •GPT-5.5 is open-weights - free to self-host with no API costs. GPT-5 requires paid API access.
- •Both models come from OpenAI. GPT-5 targets higher capability; GPT-5.5 is the faster, cheaper tier.
Specs comparison
| GPT-5 | GPT-5.5 | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Type | Closed source | Closed source |
| Context window | 128K | 128K |
| Input / 1M tokens | $10.00 | ✓Free (self-host) |
| Output / 1M tokens | $30.00 | Free (self-host) |
| Release date | 2025-06 | 2026-04 |
Strengths
GPT-5
- ✓Strong general-purpose reasoning
- ✓Excellent multimodal understanding
- ✓Broad domain knowledge
- ✓Consistent instruction following
- ✓Widely supported by third-party tools
GPT-5.5
- ✓Improved instruction following over GPT-4o
- ✓Stronger long-context coherence
- ✓Better output consistency for agentic pipelines
- ✓GPT-5.5 Pro tier for reliability-critical workloads
- ✓Easier migration path than jumping from GPT-4o to GPT-5
Which should you choose?
Choose GPT-5 if you need...
- →General-purpose API integrations
- →Multimodal applications
- →Complex reasoning tasks
- →Enterprise deployments
Choose GPT-5.5 if you need...
- →Production API integrations migrating from GPT-4o
- →Agentic workflows needing consistent structured output
- →Long-context document tasks
- →Teams deferring full GPT-5 migration costs