Model comparison
GPT-5.4 vs GPT-6 Astra
GPT-6 Astra is the stronger model overall, scoring 70.8 to 59.4 on the Noometry Index. GPT-5.4 costs 3.6× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.
Last verified . 49 shared benchmarks.
Summary
- They share 49 benchmarks with published results for both. GPT-5.4 scores higher in 3 categories and GPT-6 Astra in 7 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 61.8.
- The biggest single-benchmark swing is EBR-Bench: 25.4% for GPT-5.4 and 76.2% for GPT-6 Astra.
- GPT-5.4 is cheaper at $2.50 / $15 per million input/output tokens, against $10 / $50 for GPT-6 Astra.
Side by side
| GPT-5.4 | GPT-6 Astra | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 59.4 | 70.8 |
| Released | 2026-03-05 | 2026-09-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $2.50 | $10 |
| Output $ / M tokens | $15 | $50 |
| Results tracked | 68 | 56 |
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Category by category
Coding GPT-6 Astra leads
GPT-5.4: 52.6 (#33), GPT-6 Astra: 73.7 (#2)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| DeepSWE | 51.8% | 74.1% |
| LMArena WebDev | 1465 | 1786 |
| SciCode | 56.6% | 56.5% |
| GSO | 31.4% | 79.4% |
| WeirdML | 77.7% | 93.6% |
| LMArena Coding | 1497 | 1487 |
| MirrorCode | 15.6% | 46.7% |
| ALE-Bench | 1,607 | 2,951 |
| SWE-bench Verified | 76.9% | — |
| FrontierCode | — | 53.3% |
| FrontierSWE | — | 65.5% |
| AlgoTune | 1.85 | — |
Agentic & Tool Use GPT-6 Astra leads
GPT-5.4: 46.5 (#13), GPT-6 Astra: 52.9 (#3)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| APEX-Agents | 52.4% | 64.7% |
| Vending-Bench 2 | 6,144 | 15,515 |
| Terminal-Bench | 81.8% | — |
| Remote Labor Index | — | 20.8% |
| τ²-bench Banking | 39.4% | — |
| DeepResearch Bench | 35.1% | — |
| PostTrainBench | 19% | — |
| BALROG | — | 68.3% |
| GBAEval | 45.1% | — |
| GDP.pdf | — | 34.2% |
| LMArena Search | 1197 | — |
| METR Time Horizons | 74.3% | — |
Reasoning GPT-6 Astra leads
GPT-5.4: 61.8 (#19), GPT-6 Astra: 85.1 (#1)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| ARC-AGI-2 | 74% | 95% |
| NYT Connections (extended) | 91.3% | 98.1% |
| ARC-AGI-1 | 93.7% | 98.5% |
| CritPt | 23.4% | 31.7% |
| Chess Puzzles | 44% | 72% |
| EBR-Bench | 25.4% | 76.2% |
| LMArena Hard Prompts | 1485 | 1462 |
| Mystery Game Puzzles | 37% | 84% |
| DTBench | 94.4% | 97.3% |
| LMCA | 52% | 64.4% |
| Epoch Capabilities Index | 156.81 | 166.45 |
| Kagi LLM Benchmark | 63.8% | — |
| EnigmaEval | 16% | — |
| Thematic Generalization | 80% | — |
| Bench to the Future 3 | — | 0.14 |
| ForecastBench | 59.5 | — |
Math GPT-6 Astra leads
GPT-5.4: 73.5 (#19), GPT-6 Astra: 93.5 (#2)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| FrontierMath (Tiers 1-3) | 78.6% | 93.7% |
| FrontierMath Tier 4 | 49% | 97.6% |
| OTIS Mock AIME 2024-2025 | 97.8% | 100% |
| ProofBench | 56% | 99% |
| LMArena Math | 1488 | 1465 |
| MathArena Final-Answer Competitions | 83.1% | — |
| FrontierMath (Feb 2025 set) | 47.6% | — |
| FrontierMath Erdős | — | 2.9% |
| FrontierMath Tier 4 (v1) | 27.1% | — |
Knowledge GPT-6 Astra leads
GPT-5.4: 65.3 (#14), GPT-6 Astra: 75.3 (#1)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| GPQA Diamond | 93.3% | 95.8% |
| Humanity's Last Exam | 36.2% | 54.8% |
| SimpleQA Verified | 45.1% | 75.6% |
| Vectara Hallucination Rate | 7% | 8.7% |
| LMArena Expert | 1507 | 1483 |
Multimodal GPT-6 Astra leads
GPT-5.4: 43.7 (#20), GPT-6 Astra: 55.0 (#3)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| LMArena Vision | 1303 | 1281 |
| Blueprint-Bench 2 | 27.1% | 49.7% |
| Furniture Assembly | 37.5% | 80% |
| LMArena Document | 1471 | 1468 |
Multilingual GPT-5.4 leads
GPT-5.4: 56.2 (#23), GPT-6 Astra: 53.7 (#61)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| LMArena Non-English | 1465 | 1430 |
| LMArena Chinese | 1519 | 1484 |
| LMArena French | 1493 | 1456 |
| LMArena German | 1472 | 1440 |
| LMArena Japanese | 1485 | 1379 |
| LMArena Korean | 1448 | 1426 |
| LMArena Russian | 1480 | 1436 |
| LMArena Spanish | 1454 | 1407 |
Instruction Following Too close to call
GPT-5.4: 77.1 (#27), GPT-6 Astra: 76.3 (#44)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| LMArena Instruction Following | 1469 | 1450 |
Long Context GPT-5.4 leads
GPT-5.4: 50.3 (#8), GPT-6 Astra: 44.5 (#62)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| LMArena Longer Query | 1473 | 1456 |
| CL-bench | 27.9% | — |
| CL-bench Life | 21.7% | — |
Writing & Preference GPT-6 Astra leads
GPT-5.4: 71.9 (#17), GPT-6 Astra: 75.3 (#7)
| Benchmark | GPT-5.4 | GPT-6 Astra |
|---|---|---|
| LMArena Text | 1469 | 1441 |
| LMArena Creative Writing | 1439 | 1418 |
| EQ-Bench Creative Writing | 1840 | 2173 |
| LMArena Multi-Turn | 1482 | 1448 |
| EQ-Bench 4 | 1272 | — |
Frequently asked questions
Is GPT-5.4 better than GPT-6 Astra?
GPT-6 Astra is the stronger model overall, scoring 70.8 to 59.4 on the Noometry Index. GPT-5.4 costs 3.6× 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-5.4 or GPT-6 Astra?
GPT-5.4 is cheaper. It lists at $2.50 per million input tokens and $15 per million output tokens; GPT-6 Astra lists at $10 and $50.
Is GPT-5.4 or GPT-6 Astra better for coding?
GPT-6 Astra scores higher on coding benchmarks: 73.7 versus 52.6 in the Noometry coding category.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do GPT-5.4 and GPT-6 Astra share?
49 benchmarks have published results for both models. GPT-5.4 has 68 scored results on Noometry and GPT-6 Astra has 56.