Model comparison
Gemini 2.5 Flash-Lite vs GPT-6 Astra
GPT-6 Astra is the stronger model overall, scoring 70.8 to 37.0 on the Noometry Index. Gemini 2.5 Flash-Lite costs 114× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.
Last verified . 24 shared benchmarks.
GoogleSummary
- They share 24 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 0 categories and GPT-6 Astra in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 22.2.
- The biggest single-benchmark swing is WeirdML: 35.2% for Gemini 2.5 Flash-Lite and 93.6% for GPT-6 Astra.
- Gemini 2.5 Flash-Lite is cheaper at $0.10 / $0.40 per million input/output tokens, against $10 / $50 for GPT-6 Astra.
- GPT-6 Astra accepts more context: 1.05M tokens versus 1.05M.
Side by side
| Gemini 2.5 Flash-Lite | GPT-6 Astra | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 37.0 | 70.8 |
| Released | 2025-06-17 | 2026-09-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 128K |
| Input $ / M tokens | $0.10 | $10 |
| Output $ / M tokens | $0.40 | $50 |
| Results tracked | 33 | 56 |
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Category by category
Coding GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 38.5 (#173), GPT-6 Astra: 73.7 (#2)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| WeirdML | 35.2% | 93.6% |
| LMArena Coding | 1373 | 1487 |
| ALE-Bench | 325.9 | 2,951 |
| DeepSWE | — | 74.1% |
| FrontierCode | — | 53.3% |
| LMArena WebDev | — | 1786 |
| FrontierSWE | — | 65.5% |
| SciCode | — | 56.5% |
| GSO | — | 79.4% |
| MirrorCode | — | 46.7% |
Agentic & Tool Use GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 28.0 (#96), GPT-6 Astra: 52.9 (#3)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| APEX-Agents | — | 64.7% |
| Berkeley Function Calling Leaderboard | 36.9% | — |
| Remote Labor Index | — | 20.8% |
| BALROG | — | 68.3% |
| GDP.pdf | — | 34.2% |
| Vending-Bench 2 | — | 15,515 |
Reasoning GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 22.2 (#205), GPT-6 Astra: 85.1 (#1)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Hard Prompts | 1377 | 1462 |
| DTBench | 62.8% | 97.3% |
| LMCA | 18.1% | 64.4% |
| Epoch Capabilities Index | 133.94 | 166.45 |
| ARC-AGI-2 | — | 95% |
| Kagi LLM Benchmark | 40.5% | — |
| NYT Connections (extended) | — | 98.1% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 31.7% |
| Chess Puzzles | — | 72% |
| EBR-Bench | — | 76.2% |
| Mystery Game Puzzles | — | 84% |
| Bench to the Future 3 | — | 0.14 |
Math GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 38.0 (#144), GPT-6 Astra: 93.5 (#2)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Math | 1373 | 1465 |
| FrontierMath (Tiers 1-3) | — | 93.7% |
| FrontierMath Tier 4 | — | 97.6% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 99% |
| Omni-MATH | 48% | — |
| FrontierMath Erdős | — | 2.9% |
Knowledge GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 32.5 (#210), GPT-6 Astra: 75.3 (#1)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| Vectara Hallucination Rate | 3.3% | 8.7% |
| LMArena Expert | 1373 | 1483 |
| GPQA Diamond | — | 95.8% |
| Humanity's Last Exam | — | 54.8% |
| SimpleQA Verified | — | 75.6% |
| MMLU-Pro | 53.7% | — |
| GPQA (HELM) | 30.9% | — |
Multimodal GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 29.1 (#114), GPT-6 Astra: 55.0 (#3)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Vision | 1198 | 1281 |
| VPCT | 30% | — |
| Blueprint-Bench 2 | — | 49.7% |
| Furniture Assembly | — | 80% |
| LMArena Document | — | 1468 |
Multilingual GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 49.3 (#134), GPT-6 Astra: 53.7 (#61)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Non-English | 1369 | 1430 |
| LMArena Chinese | 1404 | 1484 |
| LMArena French | 1388 | 1456 |
| LMArena German | 1389 | 1440 |
| LMArena Japanese | 1359 | 1379 |
| LMArena Korean | 1360 | 1426 |
| LMArena Russian | 1373 | 1436 |
| LMArena Spanish | 1396 | 1407 |
Instruction Following GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 70.0 (#168), GPT-6 Astra: 76.3 (#44)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Instruction Following | 1367 | 1450 |
| IFEval | 81% | — |
Long Context GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 33.3 (#262), GPT-6 Astra: 44.5 (#62)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Longer Query | 1373 | 1456 |
| Fiction.LiveBench | 47.2% | — |
Writing & Preference GPT-6 Astra leads
Gemini 2.5 Flash-Lite: 56.8 (#135), GPT-6 Astra: 75.3 (#7)
| Benchmark | Gemini 2.5 Flash-Lite | GPT-6 Astra |
|---|---|---|
| LMArena Text | 1379 | 1441 |
| LMArena Creative Writing | 1367 | 1418 |
| LMArena Multi-Turn | 1366 | 1448 |
| EQ-Bench Creative Writing | — | 2173 |
| WildBench | 81.8% | — |
Frequently asked questions
Is Gemini 2.5 Flash-Lite better than GPT-6 Astra?
GPT-6 Astra is the stronger model overall, scoring 70.8 to 37.0 on the Noometry Index. Gemini 2.5 Flash-Lite costs 114× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.
Which is cheaper, Gemini 2.5 Flash-Lite or GPT-6 Astra?
Gemini 2.5 Flash-Lite is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; GPT-6 Astra lists at $10 and $50.
Is Gemini 2.5 Flash-Lite or GPT-6 Astra better for coding?
GPT-6 Astra scores higher on coding benchmarks: 73.7 versus 38.5 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Astra does, with 1.05M tokens against 1.05M.
How many benchmarks do Gemini 2.5 Flash-Lite and GPT-6 Astra share?
24 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and GPT-6 Astra has 56.