Introducing GPT-5.1 and Claude 4.5 Opus

GPT-5.1 and Claude 4.5 Opus are here – and when combined with your data – are even more powerful! Use them on your agents – no manuals or tweaking required. We’ve pre-optimized the models for instant use, available automatically and by dropdown menu.

Try new models now!

We did the hard part already

Our engineers spent thousands of hours testing every combination, benchmarking every configuration, and optimizing every system prompt – so your agents get smarter without you changing a single setting. Same interface. Same simplicity. Frontier AI performance with the reliability you already trust.

What’s new

GPT-5.1 for Premium & Enterprise We curated two choices for you:

• GPT-5.1 Optimal – Balanced speed and intelligence. The new default for Complex Reasoning agents. Handles 95% of business use cases beautifully.
• GPT-5.1 Smart – Deeper thinking for harder problems. When accuracy matters more than response time.

No parameter tuning. No complicated prompt engineering. Simply select from the dropdown and go. Claude 4.5 Opus for Enterprise Anthropic’s most powerful model, now available for Enterprise customers. Built for the messy stuff – regulatory interpretation, strategic decisions with competing trade-offs, customer situations that require genuine judgment. When “it depends” is the honest answer, Opus finds the nuance. Reach out now to our sales team for exclusive access.

Not sure which to pick?

Start with GPT-5.1 Optimal. It’s our default reasoning model for a reason. Reach for Smart when you’re handling complex analysis or detailed technical questions. Save Opus for when you need an expert consultant, not just a fast answer. Read more about choosing the best model for you. The best part? Your existing agents keep working exactly as before. Want to upgrade? Open Intelligence settings, pick your model, save. Done. No reconfiguration. No retraining. No downtime. And yes – we’ve maintained our benchmark-leading standards: 13% higher accuracy and 10% lower hallucination rates than standard implementations. The frontier just got more reliable.

Connect With Us

Curious how other businesses are putting these new models to work? Want to share your results or swap implementation ideas? Join the CustomGPT.ai Slack Community  and connect with peers who are building the next generation of AI-powered operations.