What Happened
On April 29, 2026, a comparison dataset sparked discussion in the community: Claude Opus 4.7 and GPT-5.5 showed clear divergence in their core strength dimensions. Claude Code lead Boris Cherny confirmed that migrating to Opus 4.7 requires an “adjustment period”—the post received 936 likes from frontline developers.
Diverging Prompt Philosophies
| Dimension | Claude Opus 4.7 | GPT-5.5 |
|---|---|---|
| Core strength | Writing, reasoning, summarization | Code, tool ecosystem |
| Interaction style | Conversational, human-like reasoning | Tool-based, structured execution |
| Experience | ”Less mechanical" | "Feature-rich but needs tuning” |
| Best scenario | Long-form writing, research analysis | Developer tools, API integration |
| SWE-Bench Pro | 64.3% | 58.6% |
| MCP Atlas | 79.1% | 75.3% |
| Terminal-Bench | Behind | 82.7% (leads) |
Opus 4.7 excels at tasks requiring architectural thinking: SWE-Bench Pro, MCP Atlas, GPQA Diamond, HLE (with/without tools), FinanceAgent v1.1 all won.
GPT-5.5 leads in tool chain depth and terminal interaction: Terminal-Bench 82.7% is currently the highest score.
The Truth About Migration Adjustment
The “adjustment period” Boris Cherny mentioned is not a performance issue—it’s an interaction paradigm shift. Opus 4.7 compared to 4.6:
- More inclined toward autonomous reasoning rather than passively waiting for instructions
- Shows stronger “chain of thought” capabilities in complex tasks
- Higher tolerance for vague instructions, but this means output may deviate from expectations
Price Controversy
Meanwhile, Opus 4.7’s pricing sparked wide discussion:
- API price: $5.00 input / $25.00 output (per 1M tokens)
- Kimi K2.6: $0.80-0.95 input / $3.60-4.00 output (~7x cheaper)
- GLM-5.1: $1.40 input / $4.40 output (~5-6x cheaper)
More critically, GitHub Copilot announced that starting June 1, Opus model multiplier will increase from 3x to 27x—a 9x price increase. This is not a “price adjustment” but a “category change.”
Selection Guide
| Your Role | Recommended Model | Reason |
|---|---|---|
| Content creator/researcher | Claude Opus 4.7 | Writing quality and reasoning depth lead |
| Full-stack developer | GPT-5.5 | Strongest tool ecosystem and API integration |
| Architect/tech lead | Claude Opus 4.7 | Better SWE-Bench Pro and MCP Atlas performance |
| Budget-conscious teams | Kimi K2.6 or GLM-5.1 | 70-80% of Opus capability at 1/5-1/7 the price |
| DevOps/terminal power users | GPT-5.5 | Strongest Terminal-Bench |