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Speculative entries are based on public hints and community discussion. No guaranteed date — always a window + sources.
Anthropic's invitation-only model via Project Glasswing — announced on June 9, 2026 alongside Fable 5. Focused on defensive cybersecurity workflows. No self-serve access, approved customers only.
Next incremental Opus iteration after 4.8 (May 2026). Anthropic ships Opus versions in quick succession — 4.5→4.6→4.7→4.8 every few months. 4.9 would be realistic for Aug/Sep 2026.
Next incremental GPT-5.x version after 5.5 (April 2026). OpenAI iterates in point releases — 5.6 or 5.5.x is more realistic than a direct GPT-6 jump in 2026.
The community expects an 'Ultra' variant with native multimodality after V4 Pro/Flash — analogous to the V3→V3.5 iteration. DeepSeek pattern: Pro and Flash shipped together, Ultra as the separate next step.
Next xAI iteration after Grok 4.3 (May 2026). xAI iterates fast — Grok 4.5 or Grok Build 1.0 are realistic next steps before a possible Grok 5.
GLM-5.2 shipped on June 20. Given Zhipu's monthly cadence (5→5.1→5.2 in April, May, June), GLM-5.3 is a very plausible next step for July 2026.
More realistic than a direct Llama 5: Meta's interim iteration of the Llama 4 family. Llama 4 Scout/Maverick shipped April 2025 — a 4.5 iteration with improved reasoning in 2026 is more likely than an immediate Llama 5 jump.
Qwen3.7 shipped as a duo (Max + Plus) in May/June 2026. Qwen3.8 is expected as the next major iteration with stronger models and possibly multimodality in H2 2026.
Mistral has shipped Voxtral (audio) and Small 4/Medium 3.5 — but Mistral Large 4 as a frontier-tier model is still missing. The gap between Medium 3.5 and a true frontier model is large; Large 4 would be the logical next step.
K2.7-Code shipped on June 15, 2026. At Moonshot's pace (K2.5 Apr→K2.6 May→K2.7 Jun), K2.8 would be plausible for July 2026 — possibly with improved multimodal focus or agentic upgrades.