Switching from GitHub Copilot Pro+ to Direct Anthropic API: A Cost Analysis

A Reddit user ran the numbers on dropping GitHub Copilot Pro+ ($39/mo) and Claude Pro ($20/mo) for direct Anthropic API access, after GitHub's 27x markup on Opus. Their usage: ~3-4 hours/day of chat-style refactors and architecture brainstorming, with occasional long-context Opus reads (about 1/week).

Cost Comparison

• Before: Copilot Pro+ $39 + Claude Pro $20 = $59/mo
• After (direct API): Sonnet 4.6 (~$45) + Opus 4.7 (~$5) = ~$50/mo

Breakdown based on tracked week: ~5M input + 2M output tokens for Sonnet 4.6, ~100K input + 50K output for Opus 4.7. Using Anthropic's published rates:

• Sonnet 4.6: $3/M input + $15/M output
• Opus 4.7: $15/M input + $75/M output

Practical Changes

• Copilot inline completions were nice for boilerplate but ~70% of use was chat-based; switching to API+CLI agent loop covered that at marginal cost.
• Sonnet 4.6 now handles ~80% of what was previously thrown at Opus — the 27x multiplier forced that reevaluation.
• No more "unlimited" feel; API billing requires attention to token usage.

What the Math Misses

• Loss of ghost-text muscle memory for boilerplate — not worth $39 after recalibration.
• VSCode IntelliSense quirks after uninstalling Copilot (half-day of adjustment).
• Heavy users (above ~50M tokens/month) may not benefit; Copilot's subsidy was actually helping them.

The post concludes that IDE vendors subsidizing model costs is ending; for this solo dev profile, direct API works $9 cheaper. Users with different usage profiles are encouraged to share their numbers.