# GPT-6 Astra vs Phi-3.5-mini

> GPT-6 Astra has enough public results to be ranked (#1); Phi-3.5-mini does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-6-astra-vs-phi-3-5-mini
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-6 Astra leads 70.5 to 34.0.
- Phi-3.5-mini has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 70.3 | 36.4 |
| Rank | 1 | — |
| Context | 1.05M | — |
| Input $/M | $10 | — |
| Output $/M | $50 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-6 Astra: 70.5 (#3)
- Phi-3.5-mini: 34.0 (#231)

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| DeepSWE | 74.1% | — |
| FrontierCode | 53.3% | — |
| LMArena WebDev | 1792 | — |
| FrontierSWE | 65.5% | — |
| SciCode | 56.5% | — |
| WeirdML | 93.6% | — |
| BigCodeBench Instruct | — | 32.8% |
| LMArena Coding | 1488 | — |
| MirrorCode | 46.7% | — |
| BigCodeBench Complete | — | 38.5% |
| ALE-Bench | 2,951 | — |

## Agentic & Tool Use

- GPT-6 Astra: 52.3 (#3)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| APEX-Agents | 64.7% | — |
| Remote Labor Index | 20.8% | — |
| BALROG | 68.3% | — |
| Vending-Bench 2 | 15,515 | — |

## Reasoning

- GPT-6 Astra: 85.1 (#1)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| ARC-AGI-2 | 95% | — |
| NYT Connections (extended) | 98.1% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| Chess Puzzles | 72% | — |
| EBR-Bench | 76.2% | — |
| LMArena Hard Prompts | 1464 | — |
| Mystery Game Puzzles | 84% | — |
| DTBench | 97.3% | — |
| LMCA | 64.4% | — |
| Bench to the Future 3 | 0.14 | — |
| Epoch Capabilities Index | 166.6 | — |
| PIQA | — | 81% |

## Math

- GPT-6 Astra: 93.4 (#1)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 93.7% | — |
| FrontierMath Tier 4 | 97.6% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 99% | — |
| LMArena Math | 1463 | — |
| FrontierMath Erdős | 2.9% | — |
| GSM8K | — | 86.2% |

## Knowledge

- GPT-6 Astra: 75.3 (#1)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| GPQA Diamond | 95.8% | — |
| Humanity's Last Exam | 54.8% | — |
| SimpleQA Verified | 75.6% | — |
| Vectara Hallucination Rate | 8.7% | — |
| LMArena Expert | 1486 | — |
| BoolQ | — | 78% |

## Multimodal

- GPT-6 Astra: 55.1 (#3)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| LMArena Vision | 1280 | — |
| Blueprint-Bench 2 | 49.7% | — |
| Furniture Assembly | 80% | — |
| LMArena Document | 1468 | — |

## Multilingual

- GPT-6 Astra: 54.0 (#53)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| LMArena Non-English | 1431 | — |
| LMArena Chinese | 1495 | — |
| LMArena French | 1467 | — |
| LMArena Russian | 1434 | — |
| LMArena Spanish | 1412 | — |

## Instruction Following

- GPT-6 Astra: 76.6 (#37)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| LMArena Instruction Following | 1454 | — |

## Long Context

- GPT-6 Astra: 44.7 (#57)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| LMArena Longer Query | 1460 | — |

## Writing & Preference

- GPT-6 Astra: 75.7 (#7)
- Phi-3.5-mini: —

| Benchmark | GPT-6 Astra | Phi-3.5-mini |
|---|---|---|
| LMArena Text | 1443 | — |
| LMArena Creative Writing | 1423 | — |
| EQ-Bench Creative Writing | 2173 | — |
| LMArena Multi-Turn | 1457 | — |

## FAQ

### Is GPT-6 Astra better than Phi-3.5-mini?

GPT-6 Astra has enough public results to be ranked (#1); Phi-3.5-mini does not yet, so treat this comparison as directional.

### Is GPT-6 Astra or Phi-3.5-mini better for coding?

GPT-6 Astra scores higher on coding benchmarks: 70.5 versus 34.0 in the Noometry coding category.

### How many benchmarks do GPT-6 Astra and Phi-3.5-mini share?

0 benchmarks have published results for both models. GPT-6 Astra has 51 scored results on Noometry and Phi-3.5-mini has 5.