Quick Answer
Claude Opus 5 vs GPT-5.6 Sol vs Gemini 3.6 Flash: Value
The Short Answer
For best value among top models in August 2026: Gemini 3.6 Flash wins on cost ($1.50/$7.50), while Claude Opus 5 and GPT-5.6 Sol justify their higher price only for hard agentic and long-horizon work.
The Comparison
| Claude Opus 5 | GPT-5.6 Sol | Gemini 3.6 Flash | |
|---|---|---|---|
| Price (in/out per MTok) | $5 / $25 | $5 / $30 | $1.50 / $7.50 |
| Cost per task* | ~$0.28 | ~$0.30 | ~$0.08 |
| Context | 1M | 1M | 1M+ |
| Signature strength | Agentic persistence | Long terminal runs, 750 tok/s | ~65% fewer output tokens |
| Best for | Multi-step coding | Autonomous agents | High-volume value |
*30K input / 5K output task.
Where Each Wins
- Gemini 3.6 Flash → value king. At $1.50/$7.50 and using up to 65% fewer output tokens than its predecessor, it’s roughly 3.5x cheaper per task than the flagships. Best for summaries, extraction, chat, and any high-volume workload where cost dominates.
- Claude Opus 5 → hard tasks that must finish. At $5/$25, its agentic persistence self-verifies and iterates until the task succeeds. Best for multi-file refactors and long bug hunts.
- GPT-5.6 Sol → autonomous speed. At $5/$30, it runs long terminal agents fast (up to 750 tok/s on Cerebras). Best for overnight autonomous runs.
How To Choose
- Cost is the constraint → Gemini 3.6 Flash.
- Task must actually finish → Claude Opus 5.
- Long autonomous terminal runs → GPT-5.6 Sol.
Verdict
- Best value → Gemini 3.6 Flash
- Best for hard coding → Claude Opus 5
- Best autonomy → GPT-5.6 Sol
Sources
- Google — Gemini 3.6 Flash: gemini.google/release-notes
- Anthropic — Claude Opus 5: anthropic.com/news/claude-opus-5
- OpenAI — GPT-5.6 Sol: openai.com/index/previewing-gpt-5-6-sol