Model comparison
GPT-6 Astra vs GPT-6 Sol
GPT-6 Astra is the stronger model overall, scoring 70.3 to 49.2 on the Noometry Index. GPT-6 Sol costs 5.0× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. GPT-6 Astra scores higher in 10 categories and GPT-6 Sol in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-6 Astra leads 93.4 to 35.8.
- The biggest single-benchmark swing is EBR-Bench: 76.2% for GPT-6 Astra and 53.3% for GPT-6 Sol.
- GPT-6 Sol is cheaper at $2 / $10 per million input/output tokens, against $10 / $50 for GPT-6 Astra.
Side by side
| GPT-6 Astra | GPT-6 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 70.3 | 49.2 |
| Released | 2026-09-03 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $10 | $2 |
| Output $ / M tokens | $50 | $10 |
| Results tracked | 51 | 22 |
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Category by category
Coding GPT-6 Astra leads
GPT-6 Astra: 70.5 (#3), GPT-6 Sol: 59.6 (#11)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| DeepSWE | 74.1% | 68.8% |
| FrontierCode | 53.3% | 49.3% |
| LMArena WebDev | 1792 | 1692 |
| LMArena Coding | 1488 | 1453 |
| FrontierSWE | 65.5% | — |
| SciCode | 56.5% | — |
| WeirdML | 93.6% | — |
| MirrorCode | 46.7% | — |
| ALE-Bench | 2,951 | — |
Agentic & Tool Use GPT-6 Astra leads
GPT-6 Astra: 52.3 (#3), GPT-6 Sol: 33.5 (#49)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| APEX-Agents | 64.7% | — |
| Remote Labor Index | 20.8% | — |
| BALROG | 68.3% | — |
| GDP.pdf | — | 28% |
| Vending-Bench 2 | 15,515 | — |
Reasoning GPT-6 Astra leads
GPT-6 Astra: 85.1 (#1), GPT-6 Sol: 49.3 (#34)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| NYT Connections (extended) | 98.1% | 90.1% |
| EBR-Bench | 76.2% | 53.3% |
| LMArena Hard Prompts | 1464 | 1420 |
| ARC-AGI-2 | 95% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| Chess Puzzles | 72% | — |
| Mystery Game Puzzles | 84% | — |
| DTBench | 97.3% | — |
| LMCA | 64.4% | — |
| Bench to the Future 3 | 0.14 | — |
| Epoch Capabilities Index | 166.6 | — |
Math GPT-6 Astra leads
GPT-6 Astra: 93.4 (#1), GPT-6 Sol: 35.8 (#135)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| LMArena Math | 1463 | 1404 |
| FrontierMath (Tiers 1-3) | 93.7% | — |
| FrontierMath Tier 4 | 97.6% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 99% | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge GPT-6 Astra leads
GPT-6 Astra: 75.3 (#1), GPT-6 Sol: 43.0 (#87)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| Vectara Hallucination Rate | 8.7% | 6.5% |
| LMArena Expert | 1486 | 1449 |
| GPQA Diamond | 95.8% | — |
| Humanity's Last Exam | 54.8% | — |
| SimpleQA Verified | 75.6% | — |
Multimodal GPT-6 Astra leads
GPT-6 Astra: 55.1 (#3), GPT-6 Sol: 47.6 (#9)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| Furniture Assembly | 80% | 58.3% |
| LMArena Vision | 1280 | — |
| Blueprint-Bench 2 | 49.7% | — |
| LMArena Document | 1468 | — |
Multilingual GPT-6 Astra leads
GPT-6 Astra: 54.0 (#53), GPT-6 Sol: 51.0 (#113)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| LMArena Non-English | 1431 | 1389 |
| LMArena Chinese | 1495 | 1416 |
| LMArena Russian | 1434 | 1407 |
| LMArena Spanish | 1412 | 1377 |
| LMArena French | 1467 | — |
Instruction Following GPT-6 Astra leads
GPT-6 Astra: 76.6 (#37), GPT-6 Sol: 74.4 (#97)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| LMArena Instruction Following | 1454 | 1406 |
Long Context GPT-6 Astra leads
GPT-6 Astra: 44.7 (#57), GPT-6 Sol: 43.2 (#100)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| LMArena Longer Query | 1460 | 1415 |
Writing & Preference GPT-6 Astra leads
GPT-6 Astra: 75.7 (#7), GPT-6 Sol: 72.3 (#15)
| Benchmark | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| LMArena Text | 1443 | 1396 |
| LMArena Creative Writing | 1423 | 1392 |
| EQ-Bench Creative Writing | 2173 | 2125 |
| LMArena Multi-Turn | 1457 | 1405 |
Frequently asked questions
Is GPT-6 Astra better than GPT-6 Sol?
GPT-6 Astra is the stronger model overall, scoring 70.3 to 49.2 on the Noometry Index. GPT-6 Sol costs 5.0× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.
Which is cheaper, GPT-6 Astra or GPT-6 Sol?
GPT-6 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; GPT-6 Astra lists at $10 and $50.
Is GPT-6 Astra or GPT-6 Sol better for coding?
GPT-6 Astra scores higher on coding benchmarks: 70.5 versus 59.6 in the Noometry coding category.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do GPT-6 Astra and GPT-6 Sol share?
21 benchmarks have published results for both models. GPT-6 Astra has 51 scored results on Noometry and GPT-6 Sol has 22.