GPT-5.6 Sol vs GPT-6 Astra
EBR Bench?
GPT-5.6 Solat max44.8
GPT-6 Astraat max76.2
Harvey LAB-AA 1.1?
GPT-5.6 Sol—
GPT-6 Astraat max8.6
SpireClimb?
GPT-5.6 Sol—
GPT-6 Astraat max25.7
SpireClimb StS1 A20 Heart?
GPT-5.6 Sol—
GPT-6 Astraat max16.7
SpireClimb StS2 A10?
GPT-5.6 Sol—
GPT-6 Astraat max34.7
| Benchmark | GPT-5.6 Sol | GPT-6 Astra |
|---|---|---|
| AutomationBench-AA | 51.3 | 64.6 |
| GDPval-AA (work tasks) 2.1 | 1,422.3 | 1,498 |
| τ³-Banking · AA | 36.5 | 35.5 |
| AA Analyst Agent | 47.5 · max | 51.3 · max |
| ITBench SRE | 56.2 · max | 48.6 · max |
| Terminal-Bench 4.0 | 14.6 | 49.5 |
| Terminal-Bench Science 0.1 | 22.4 · max | 63.3 · max |
| AA-Briefcase 1.1 · Elo | 1,240.1 | 1,460.4 |
| AA-LCR (long context) 1.1 | 80.3 | 79.7 |
| DeepSWE 1.1 | 61.1 | 72.8 |
| SWE-bench Pro (v2 full) | 95.5 · xhigh | 96.9 · high |
| SWE-bench Pro (v2 hard) | 82.4 · xhigh | 90.2 · high |
| EBR Bench | 44.8 · max | 76.2 · max |
| Furniture Assembly | 56.7 · max | 80 · max |
| AutomationBench · Zapier run | — | 34.1 |
| τ³-bench · banking · 1.0.1 | 46.9 · xhigh | — |
| Terminal-Bench Hard (version unstated) | 62.9 | — |
| EnterpriseOps-Gym-AA | 42.9 · max | — |
| FrontierCode 1.1 | — | 47 · max |
| Harvey LAB-AA 1.1 | — | 8.6 · max |
| SpireClimb | — | 25.7 · max |
| SpireClimb StS1 A20 Heart | — | 16.7 · max |
| SpireClimb StS2 A10 | — | 34.7 · max |
Specs
| Spec | GPT-5.6 Sol | GPT-6 Astra |
|---|---|---|
| Input, per 1M | $4 | $10 |
| Output, per 1M | $20 | $50 |
| Cost per task? | $0.50 | $1.54 |
| Speed, tok/s | 75 | 59 |
| Context | 1.05M | 1.05M |
| Weights | Closed | Closed |
| Released | Jul 2026 | Sep 2026 |
| See images | ✓ | ✓ |
| Read PDFs | Partial | Partial |
| Hear audio | — | — |
| Watch video | — | — |
| Call tools | ✓ | ✓ |
| Force a tool call | Partial | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ✓ |
| Run code | ? | ✓ |
| Use a computer | ? | ✓ |
What breaks when you switch
GPT-5.6 Sol → GPT-6 Astra
Monitoring can return HTTP 403›
Misalignment monitoring can return HTTP 403 before streaming or errors after output; match misalignment_policy_violation and handle stream errors.
No none reasoning effort›
The none reasoning effort is unsupported on GPT-6 Astra and GPT-6.1 Sol; use low instead.
Remove unsupported sampling parameters›
When reasoning effort is not none, remove temperature, top_p and top_logprobs, plus Chat Completions logprobs or Responses output logprobs inclusion.
GPT-6 Astra → GPT-5.6 Sol
Nothing known.