# GPT-5.4 and Claude Sonnet 4.6 replace the older models

Published: 2026-04-26 | Source: https://geoready.co/news/gpt-54-claude-sonnet-46-launch

Our AI test now runs against the latest flagship models from OpenAI and Anthropic, plus Gemini 2.5 Pro and Qwen3.6. You get a more realistic picture of what end users see today.

AI models move fast. An audit run against last year's GPT version tells you how your brand was visible - not how it is right now. So we've upgraded the entire model lineup.

## What we test now

- **GPT-5.4** (OpenAI) - the flagship behind ChatGPT.
- **Claude Sonnet 4.6** (Anthropic) - powers Claude.ai and a large share of enterprise AI.
- **Gemini 2.5 Pro** (Google) - used in AI Overviews and the post-Bard generation.
- **Qwen3.6** (Alibaba) - a fast-growing open-weight model used heavily in Asia and by developers.
- **Mistral Large** - the European entry, popular with enterprises that want EU hosting.

## Why this matters for your score

Newer models typically have:

1. **Better brand recall** for large, established brands - they're trained on more data.
2. **Stricter fact-checking** - hallucinations drop, but small brands with thin online presence risk being skipped entirely.
3. **Different citation patterns** - they cite authoritative sources (Wikipedia, major outlets) more often than brand-owned pages.

If your score shifts noticeably from the previous audit, it isn't necessarily because your brand became more or less visible - it can be the model behaving differently. Use the trend chart to read the longer movement.

## What you can do

- Read your top recommendations after the next audit - they're calibrated for how the new models crawl and cite.
- If you don't have an `llms.txt` yet: add one. The newer models read it more often than their predecessors.
- Make sure your brand shows up clearly in authoritative third-party sources. That counts more now than before.