Model comparison
Claude Sonnet 5.5 vs Reka Flash 3
Claude Sonnet 5.5 has enough public results to be ranked (#10); Reka Flash 3 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in agentic & tool use, where Claude Sonnet 5.5 leads 44.9 to 30.1.
- Reka Flash 3 is cheaper at $0.10 / $0.20 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 66K.
- Reka Flash 3 has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | Reka Flash 3 | |
|---|---|---|
| Provider | Anthropic | Reka |
| Noometry Index | 60.5 | 36.4 |
| Released | 2026-09-28 | 2025-03-10 |
| Weights | Proprietary | Open |
| Context window | 1M | 66K |
| Max output | 128K | 59K |
| Input $ / M tokens | $2 | $0.10 |
| Output $ / M tokens | $10 | $0.20 |
| Results tracked | 16 | 2 |
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Category by category
Coding Not comparable
Claude Sonnet 5.5: 65.5 (#6), Reka Flash 3: —
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 44.9 (#14), Reka Flash 3: 30.1
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| APEX-Agents | 75.5% | — |
| BALROG | — | 29.2% |
Reasoning Not comparable
Claude Sonnet 5.5: 52.4 (#29), Reka Flash 3: —
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| CritPt | 31.4% | — |
| Mystery Game Puzzles | 65% | — |
Math Not comparable
Claude Sonnet 5.5: 88.7 (#4), Reka Flash 3: —
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
Knowledge Not comparable
Claude Sonnet 5.5: 66.0 (#11), Reka Flash 3: —
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Not comparable
Claude Sonnet 5.5: 53.2 (#5), Reka Flash 3: —
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| Furniture Assembly | 75% | — |
Writing & Preference Not comparable
Claude Sonnet 5.5: —, Reka Flash 3: 43.8
| Benchmark | Claude Sonnet 5.5 | Reka Flash 3 |
|---|---|---|
| EQ-Bench Creative Writing | — | 1228 |
Frequently asked questions
Is Claude Sonnet 5.5 better than Reka Flash 3?
Claude Sonnet 5.5 has enough public results to be ranked (#10); Reka Flash 3 does not yet, so treat this comparison as directional.
Which is cheaper, Claude Sonnet 5.5 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; Claude Sonnet 5.5 lists at $2 and $10.
Which has the bigger context window?
Claude Sonnet 5.5 does, with 1M tokens against 66K.
How many benchmarks do Claude Sonnet 5.5 and Reka Flash 3 share?
0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Reka Flash 3 has 2.