Model comparison
GPT-5 vs Reka Flash 3
GPT-5 has enough public results to be ranked (#37); Reka Flash 3 does not yet, so treat this comparison as directional.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. GPT-5 scores higher in 2 categories and Reka Flash 3 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5 leads 63.5 to 43.8.
- Reka Flash 3 is cheaper at $0.10 / $0.20 per million input/output tokens, against $1.25 / $10 for GPT-5.
- GPT-5 accepts more context: 400K tokens versus 66K.
- Reka Flash 3 has downloadable open weights; the other is API-only.
Side by side
| GPT-5 | Reka Flash 3 | |
|---|---|---|
| Provider | OpenAI | Reka |
| Noometry Index | 50.9 | 36.4 |
| Released | 2025-08-07 | 2025-03-10 |
| Weights | Proprietary | Open |
| Context window | 400K | 66K |
| Max output | 128K | 59K |
| Input $ / M tokens | $1.25 | $0.10 |
| Output $ / M tokens | $10 | $0.20 |
| Results tracked | 69 | 2 |
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Category by category
Coding Not comparable
GPT-5: 50.7 (#39), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| SWE-bench Verified | 73.6% | — |
| SWE-bench Verified (bash only) | 65% | — |
| Aider Polyglot | 88% | — |
| LMArena WebDev | 1417 | — |
| SciCode | 42.9% | — |
| GSO | 6.9% | — |
| WeirdML | 60.7% | — |
| LMArena Coding | 1436 | — |
| ALE-Bench | 1,162 | — |
| AlgoTune | 1.67 | — |
Agentic & Tool Use GPT-5 leads
GPT-5: 33.0 (#53), Reka Flash 3: 30.1
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| BALROG | 32.8% | 29.2% |
| Terminal-Bench | 49.6% | — |
| GDPval | 34.8% | — |
| Remote Labor Index | 1.7% | — |
| DeepResearch Bench | 49.6% | — |
| LMArena Search | 1133 | — |
| METR Time Horizons | 69.6% | — |
Reasoning Not comparable
GPT-5: 38.3 (#55), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| ARC-AGI-2 | 9.9% | — |
| SimpleBench | 56.7% | — |
| Kagi LLM Benchmark | 72.7% | — |
| ARC-AGI-1 | 65.7% | — |
| CritPt | 12.6% | — |
| Chess Puzzles | 37% | — |
| EnigmaEval | 10.5% | — |
| EBR-Bench | 12.7% | — |
| LMArena Hard Prompts | 1415 | — |
| Mystery Game Puzzles | 23% | — |
| DTBench | 90.7% | — |
| LMCA | 40% | — |
| Epoch Capabilities Index | 150 | — |
| ForecastBench | 61.4 | — |
Math Not comparable
GPT-5: 54.6 (#36), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.4% | — |
| FrontierMath Tier 4 | 22% | — |
| OTIS Mock AIME 2024-2025 | 91.4% | — |
| ProofBench | 18% | — |
| Omni-MATH | 64.7% | — |
| LMArena Math | 1406 | — |
| MATH Level 5 | 98.1% | — |
| FrontierMath (Feb 2025 set) | 32.4% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |
Knowledge Not comparable
GPT-5: 56.5 (#37), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| GPQA Diamond | 86.2% | — |
| Humanity's Last Exam | 25.3% | — |
| SimpleQA Verified | 50.1% | — |
| MMLU-Pro | 86.3% | — |
| Confabulations | 10.3% | — |
| Vectara Hallucination Rate | 14.7% | — |
| GPQA (HELM) | 79.2% | — |
| LMArena Expert | 1420 | — |
Multimodal Not comparable
GPT-5: 46.1 (#12), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| LMArena Vision | 1232 | — |
| GeoBench | 81% | — |
| VPCT | 66% | — |
Multilingual Not comparable
GPT-5: 51.5 (#105), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| LMArena Non-English | 1397 | — |
| LMArena Chinese | 1423 | — |
| LMArena French | 1409 | — |
| LMArena German | 1415 | — |
| LMArena Japanese | 1411 | — |
| LMArena Korean | 1361 | — |
| LMArena Russian | 1406 | — |
| LMArena Spanish | 1398 | — |
Instruction Following Not comparable
GPT-5: 74.0 (#107), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| IFEval | 87.5% | — |
| LMArena Instruction Following | 1388 | — |
Long Context Not comparable
GPT-5: 69.5 (#2), Reka Flash 3: —
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| Fiction.LiveBench | 97.2% | — |
| LMArena Longer Query | 1399 | — |
Writing & Preference GPT-5 leads
GPT-5: 63.5 (#63), Reka Flash 3: 43.8
| Benchmark | GPT-5 | Reka Flash 3 |
|---|---|---|
| EQ-Bench Creative Writing | 1627 | 1228 |
| LMArena Text | 1406 | — |
| LMArena Creative Writing | 1365 | — |
| Short-Story Creative Writing | 86% | — |
| WildBench | 85.7% | — |
| LMArena Multi-Turn | 1426 | — |
Frequently asked questions
Is GPT-5 better than Reka Flash 3?
GPT-5 has enough public results to be ranked (#37); Reka Flash 3 does not yet, so treat this comparison as directional.
Which is cheaper, GPT-5 or Reka Flash 3?
Reka Flash 3 is cheaper. It lists at $0.10 per million input tokens and $0.20 per million output tokens; GPT-5 lists at $1.25 and $10.
Which has the bigger context window?
GPT-5 does, with 400K tokens against 66K.
How many benchmarks do GPT-5 and Reka Flash 3 share?
2 benchmarks have published results for both models. GPT-5 has 69 scored results on Noometry and Reka Flash 3 has 2.