claude-haiku-4-5 vs gpt-5.6-terra
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-haiku-4-5 | gpt-5.6-terra | Advantage |
|---|---|---|---|
| Capability | 63% | 53% | +10% (claude-haiku-4-5 leads) |
| Median task time | 3m 58s | 1m 49s | 2m 9s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.005 / task | $0.007 / task | $0.003 / task lower (claude-haiku-4-5 leads) |
claude-haiku-4-5: 5.0% of Claude Max 20x (5.0% / 5h, 1.0% / 1w) per run. gpt-5.6-terra: 2.4% of ChatGPT Plus (2.4% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | claude-haiku-4-5 | gpt-5.6-terra | Advantage |
|---|---|---|---|
| Capability | 24% | 62% | +38% (gpt-5.6-terra leads) |
| Median task time | 3m 4s | 2m 15s | 49s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.003 / task | $0.005 / task | $0.001 / task lower (claude-haiku-4-5 leads) |
claude-haiku-4-5: 1.0% of Claude Max 20x (1.0% / 5h) per run. gpt-5.6-terra: 0.4% of ChatGPT Plus (0.4% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | claude-haiku-4-5 | gpt-5.6-terra | Advantage |
|---|---|---|---|
| Capability | 23% | 38% | +15% (gpt-5.6-terra leads) |
| Median task time | 4m 18s | 2m 52s | 1m 25s faster (gpt-5.6-terra leads) |
| Approx. task cost | not measured | $0.008 / task | - |
claude-haiku-4-5: 0.0% of Claude Max 20x per good solve. gpt-5.6-terra: 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-haiku-4-5 or gpt-5.6-terra?
gpt-5.6-terra clears higher: tier 3 of 5 versus tier 2 for claude-haiku-4-5 on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-18.
How much do claude-haiku-4-5 and gpt-5.6-terra cost?
claude-haiku-4-5 runs on Claude Max 20x at $200/month (public price as of 2026-08-05). gpt-5.6-terra runs on ChatGPT Plus at $20/month (public price as of 2026-07-20).