June 2026 has seen the most concentrated AI model releases in history. Claude Opus 4.8, GPT-5.5, Gemini 3.5 Flash - but only one has actually shipped as a flagship. Here's what the numbers actually mean.
What's Actually Available
As of June 17, 2026, three models have shipped:
- Claude Opus 4.8 (May 28) - Anthropic's current best
- GPT-5.5 (April 23) - OpenAI's active flagship
- Gemini 3.5 Flash (May 19) - Google's cost-optimized option
GPT-5.6 and Gemini 3.5 Pro are rumors or limited preview. Don't benchmark against them yet.
Key Numbers
| Benchmark | Opus 4.8 | GPT-5.5 | Gemini Flash |
|---|---|---|---|
| SWE-bench Pro | 69.2% | 58.6% | ~54% |
| Terminal-Bench | 74.6% | 82.7% | 76.2% |
| Price (in/out /M) | \/\ | \/\ | .50/\ |
Practical Picks
- Agentic coding ? Claude Opus 4.8
- Terminal/DevOps automation ? GPT-5.5
- High-volume, cost-sensitive ? Gemini 3.5 Flash
Release cycles have collapsed to under 60 days. Build your stack to swap models easily.
More AI analysis at wdsega.github.io
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