Model comparison
Gemini 2.5 Flash vs Sonar
Gemini 2.5 Flash and Sonar score almost the same on the Noometry Index (39.3 vs 38.5), so choose on price, context window or the category you care about most.
Last verified . 0 shared benchmarks.
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PerplexitySummary
- The widest gap is in math, where Gemini 2.5 Flash leads 39.9 to 33.7.
- Gemini 2.5 Flash is cheaper at $0.30 / $2.50 per million input/output tokens, against $1 / $1 for Sonar.
- Gemini 2.5 Flash accepts more context: 1.05M tokens versus 128K.
Side by side
| Gemini 2.5 Flash | Sonar | |
|---|---|---|
| Provider | Perplexity | |
| Noometry Index | 39.3 | 38.5 |
| Released | 2025-04-17 | 2024-01-01 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 66K | 4K |
| Input $ / M tokens | $0.30 | $1 |
| Output $ / M tokens | $2.50 | $1 |
| Results tracked | 54 | 7 |
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Category by category
Coding Too close to call
Gemini 2.5 Flash: 35.8 (#220), Sonar: 35.7 (#221)
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| WeirdML | 41.9% | — |
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1424 | — |
| ALE-Bench | 661.88 | — |
Agentic & Tool Use Not comparable
Gemini 2.5 Flash: 30.8 (#74), Sonar: —
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| Terminal-Bench | 17.1% | — |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| BALROG | 33.5% | — |
| Vending-Bench 2 | 548.84 | — |
Reasoning Sonar leads
Gemini 2.5 Flash: 18.1 (#286), Sonar: 21.1 (#227)
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| ARC-AGI-2 | 2.5% | — |
| SimpleBench | 41.2% | — |
| Kagi LLM Benchmark | 56.8% | — |
| ARC-AGI-1 | 33.3% | — |
| CritPt | 1.1% | — |
| EnigmaEval | 2.7% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1422 | — |
| DTBench | 76.5% | — |
| LiveBench Data Analysis | — | 37.9% |
| LMCA | 27.5% | — |
| Epoch Capabilities Index | 143.03 | — |
| ForecastBench | 60.6 | — |
| LiveBench | — | 46.9% |
Math Gemini 2.5 Flash leads
Gemini 2.5 Flash: 39.9 (#98), Sonar: 33.7 (#200)
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.1% | — |
| Omni-MATH | 38.5% | — |
| LiveBench Math | — | 41.6% |
| LMArena Math | 1415 | — |
| FrontierMath (Feb 2025 set) | 4.8% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Gemini 2.5 Flash: 36.4 (#168), Sonar: —
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| Humanity's Last Exam | 12.1% | — |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| Vectara Hallucination Rate | 7.8% | — |
| GPQA (HELM) | 39% | — |
| LMArena Expert | 1426 | — |
Multimodal Not comparable
Gemini 2.5 Flash: 41.8 (#32), Sonar: —
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| LMArena Vision | 1253 | — |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |
Multilingual Not comparable
Gemini 2.5 Flash: 52.3 (#88), Sonar: —
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| LMArena Non-English | 1409 | — |
| LMArena Chinese | 1450 | — |
| LMArena French | 1433 | — |
| LMArena German | 1418 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1385 | — |
| LMArena Russian | 1415 | — |
| LMArena Spanish | 1421 | — |
Instruction Following Gemini 2.5 Flash leads
Gemini 2.5 Flash: 75.7 (#54), Sonar: 71.4 (#150)
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| IFEval | 89.8% | — |
| LMArena Instruction Following | 1405 | — |
Long Context Not comparable
Gemini 2.5 Flash: 47.5 (#17), Sonar: —
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| Fiction.LiveBench | 77.8% | — |
| LMArena Longer Query | 1419 | — |
Writing & Preference Gemini 2.5 Flash leads
Gemini 2.5 Flash: 53.8 (#157), Sonar: 52.6 (#167)
| Benchmark | Gemini 2.5 Flash | Sonar |
|---|---|---|
| LMArena Text | 1417 | — |
| LMArena Creative Writing | 1400 | — |
| Short-Story Creative Writing | 76.5% | — |
| EQ-Bench Creative Writing | 1137 | — |
| WildBench | 81.7% | — |
| LMArena Multi-Turn | 1408 | — |
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is Gemini 2.5 Flash better than Sonar?
Gemini 2.5 Flash and Sonar score almost the same on the Noometry Index (39.3 vs 38.5), so choose on price, context window or the category you care about most.
Which is cheaper, Gemini 2.5 Flash or Sonar?
Gemini 2.5 Flash is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; Sonar lists at $1 and $1.
Is Gemini 2.5 Flash or Sonar better for coding?
They score almost the same on coding (35.8 vs 35.7); test both on your own repository before choosing.
Which has the bigger context window?
Gemini 2.5 Flash does, with 1.05M tokens against 128K.
How many benchmarks do Gemini 2.5 Flash and Sonar share?
0 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and Sonar has 7.