Model comparison
o3 vs Reka Flash 3
o3 has enough public results to be ranked (#61); Reka Flash 3 does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. o3 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 o3 leads 63.5 to 43.7.
- Reka Flash 3 is cheaper at $0.10 / $0.20 per million input/output tokens, against $2 / $8 for o3.
- o3 accepts more context: 200K tokens versus 66K.
- Reka Flash 3 has downloadable open weights; the other is API-only.
Side by side
| o3 | Reka Flash 3 | |
|---|---|---|
| Provider | OpenAI | Reka |
| Noometry Index | 47.5 | 36.8 |
| Released | 2025-04-16 | 2025-03-10 |
| Weights | Proprietary | Open |
| Context window | 200K | 66K |
| Max output | 100K | 59K |
| Input $ / M tokens | $2 | $0.10 |
| Output $ / M tokens | $8 | $0.20 |
| Results tracked | 63 | 2 |
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Category by category
Coding Not comparable
o3: 46.8 (#64), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| SWE-bench Verified | 62.3% | — |
| SWE-bench Verified (bash only) | 58.4% | — |
| Aider Polyglot | 81.3% | — |
| GSO | 8.8% | — |
| WeirdML | 52.4% | — |
| LMArena Coding | 1408 | — |
| CadEval | 74% | — |
| ALE-Bench | 933.55 | — |
Agentic & Tool Use o3 leads
o3: 34.5 (#44), Reka Flash 3: 30.4
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 63% | — |
| GDPval | 30.8% | — |
| DeepResearch Bench | 45.2% | — |
| OSWorld | 23% | — |
| BALROG | — | 29.2% |
| LMArena Search | 1144 | — |
| METR Time Horizons | 65.4% | — |
Reasoning Not comparable
o3: 32.0 (#78), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| ARC-AGI-2 | 6.5% | — |
| SimpleBench | 53.1% | — |
| Kagi LLM Benchmark | 67.6% | — |
| ARC-AGI-1 | 60.8% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 38% | — |
| EnigmaEval | 13.1% | — |
| LMArena Hard Prompts | 1402 | — |
| Mystery Game Puzzles | 29% | — |
| DTBench | 84.8% | — |
| LMCA | 39.7% | — |
| Epoch Capabilities Index | 146.86 | — |
| ForecastBench | 62.5 | — |
Math Not comparable
o3: 50.2 (#58), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 33.3% | — |
| OTIS Mock AIME 2024-2025 | 84.4% | — |
| Omni-MATH | 71.4% | — |
| LMArena Math | 1426 | — |
| MATH Level 5 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 18.7% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge Not comparable
o3: 54.6 (#52), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 20.3% | — |
| SimpleQA Verified | 49.4% | — |
| MMLU-Pro | 85.9% | — |
| Confabulations | 14.4% | — |
| GPQA (HELM) | 75.3% | — |
| LMArena Expert | 1402 | — |
Multimodal Not comparable
o3: 41.4 (#36), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| LMArena Vision | 1214 | — |
| GeoBench | 74% | — |
| VPCT | 52% | — |
Multilingual Not comparable
o3: 51.7 (#105), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| LMArena Non-English | 1401 | — |
| LMArena Chinese | 1437 | — |
| LMArena French | 1430 | — |
| LMArena German | 1420 | — |
| LMArena Japanese | 1403 | — |
| LMArena Korean | 1370 | — |
| LMArena Russian | 1406 | — |
| LMArena Spanish | 1395 | — |
Instruction Following Not comparable
o3: 72.8 (#127), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| IFEval | 86.9% | — |
| LMArena Instruction Following | 1368 | — |
Long Context Not comparable
o3: 53.3 (#6), Reka Flash 3: —
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| Fiction.LiveBench | 88.9% | — |
| CL-bench | 17.8% | — |
| LMArena Longer Query | 1372 | — |
Writing & Preference o3 leads
o3: 63.5 (#64), Reka Flash 3: 43.7
| Benchmark | o3 | Reka Flash 3 |
|---|---|---|
| EQ-Bench Creative Writing | 1676 | 1228 |
| LMArena Text | 1410 | — |
| LMArena Creative Writing | 1359 | — |
| Short-Story Creative Writing | 83.9% | — |
| WildBench | 86.1% | — |
| LMArena Multi-Turn | 1405 | — |
Frequently asked questions
Is o3 better than Reka Flash 3?
o3 has enough public results to be ranked (#61); Reka Flash 3 does not yet, so treat this comparison as directional.
Which is cheaper, o3 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; o3 lists at $2 and $8.
Which has the bigger context window?
o3 does, with 200K tokens against 66K.
How many benchmarks do o3 and Reka Flash 3 share?
1 benchmark has published results for both models. o3 has 63 scored results on Noometry and Reka Flash 3 has 2.