claude-sonnet-5 vs gpt-5.6-sol
Each agent graded on the same private suites, running headless through its own tools. Advantages are oriented so a win is a win, whichever way the metric runs.
| Dimension | claude-sonnet-5 | gpt-5.6-sol | Advantage |
|---|---|---|---|
| Capability | 50% | 60% | +10% (gpt-5.6-sol leads) |
| Median task time | 4m 22s | 2m 28s | 1m 53s faster (gpt-5.6-sol leads) |
| Approx. task cost | $0.005 / task | $0.011 / task | $0.005 / task lower (claude-sonnet-5 leads) |
claude-sonnet-5: 6.0% of Claude Max 20x (6.0% / 5h, 1.0% / 1w) per run. gpt-5.6-sol: 3.5% of ChatGPT Plus (3.5% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | claude-sonnet-5 | gpt-5.6-sol | Advantage |
|---|---|---|---|
| Capability | 39% | 67% | +28% (gpt-5.6-sol leads) |
| Median task time | 4m 38s | 4m 11s | 27s faster (gpt-5.6-sol leads) |
| Approx. task cost | $0.010 / task | $0.010 / task | $0.000 / task lower (gpt-5.6-sol leads) |
claude-sonnet-5: 3.0% of Claude Max 20x (3.0% / 5h) per run. gpt-5.6-sol: 0.9% of ChatGPT Plus (0.9% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | claude-sonnet-5 | gpt-5.6-sol | Advantage |
|---|---|---|---|
| Capability | 34% | 56% | +22% (gpt-5.6-sol leads) |
| Median task time | 5m 17s | 3m 43s | 1m 33s faster (gpt-5.6-sol leads) |
| Approx. task cost | $0.008 / task | $0.011 / task | $0.003 / task lower (claude-sonnet-5 leads) |
claude-sonnet-5: 0.6% of Claude Max 20x (0.6% / 5h) per good solve. gpt-5.6-sol: 0.2% of ChatGPT Plus (0.2% / 1w) per good solve. Each figure is a share of that agent's own plan, so there is no delta to draw.
Grades and deltas are comparable only within a suite version. See methodology.
Frequently asked questions
Which is better for coding, claude-sonnet-5 or gpt-5.6-sol?
gpt-5.6-sol clears higher: tier 4 of 5 versus tier 2 for claude-sonnet-5 on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-18.
How much do claude-sonnet-5 and gpt-5.6-sol cost?
claude-sonnet-5 runs on Claude Max 20x at $200/month (public price as of 2026-08-05). gpt-5.6-sol runs on ChatGPT Plus at $20/month (public price as of 2026-07-20).