GPT-5.6 Sol vs Sonar Reasoning Pro
At a Glance
| Compare |  GPT-5.6 SolOpenAI |  Sonar Reasoning ProPerplexity |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #5 of 4685.3 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #24 of 44$0.117 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #3 of 3865.3 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $2.00Openrouter ↗ · Sep 22, 2026 | $2.00Openrouter ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | $10.00Openrouter ↗ · Sep 22, 2026 | $8.00Openrouter ↗ · Sep 22, 2026 |
| Context windowMaximum documented tokens | 1,050K | 128K |
| Model facts checked | Aug 28, 2026View model evidence → | Aug 29, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | GPT-5.6 Sol | Sonar Reasoning Pro |
|---|---|---|
| LMArena Search Arenasearch-2026-08-24-d25aabda0010 · arena_rating · leader | 1,257.26100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1249.79496224, 1264.72573796]; votes 29663; rank 1 | 1,138.6091% of row best · rating · ppl-sonar-reasoning-pro-high; 95% CI [1132.86119454, 1144.34164089]; votes 29055; rank 29 |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark winNo overall winner | 0 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | GPT-5.6 Sol | Sonar Reasoning Pro |
|---|---|---|
| Developer | OpenAI | Perplexity |
| Family | Gpt 5 6 | Sonar |
| Model | GPT-5.6 Sol | Sonar Reasoning Pro |
| Version | GPT-5.6 Sol | Sonar Reasoning Pro |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | 2026-02-16 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,050K | 128K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, citations, reasoning, search |
GPT-5.6 Sol Capabilities
Sonar Reasoning Pro Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
GPT-5.6 SolOpenAI | vs | GPT-6 AstraOpenAI | family variantsimage, text |
Claude Fable 5.1Anthropic | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
 Gemini 3.1 ProGoogle DeepMind | vs | GPT-5.6 SolOpenAI | cross-developer peerstext |
 DeepSeek-V4.1-FlashDeepSeek | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
GPT-5.6 SolOpenAI | vs | Grok 4.6xAI | cross-developer peersimage, text |
GPT-5.6 SolOpenAI | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
 Kimi-K3Moonshot AI | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
GPT-5.6 SolOpenAI | vs |  GLM-5.3Z.ai | cross-developer peerstext |
GPT-5.6 SolOpenAI | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
 Mistral Large 3Mistral AI | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-5.6 Sol vs Sonar Reasoning Pro FAQs
Is GPT-5.6 Sol or Sonar Reasoning Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.6 Sol and Sonar Reasoning Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.6 Sol or Sonar Reasoning Pro?+
GPT-5.6 Sol is $2.00 and Sonar Reasoning Pro is $2.00 per million tokens, so they are tied on this metric. GPT-5.6 Sol is $10.00 and Sonar Reasoning Pro is $8.00 per million tokens, so Sonar Reasoning Pro is cheaper on this metric.
Which has a larger context window, GPT-5.6 Sol or Sonar Reasoning Pro?+
GPT-5.6 Sol has the larger sourced context window. GPT-5.6 Sol supports 1,050K and Sonar Reasoning Pro supports 128K.
Which performs better in benchmarks, GPT-5.6 Sol or Sonar Reasoning Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.6 Sol or Sonar Reasoning Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.6 Sol is not marked open weight; Sonar Reasoning Pro is not marked open weight.
Can GPT-5.6 Sol and Sonar Reasoning Pro understand images?+
GPT-5.6 Sol is documented with image input; Sonar Reasoning Pro is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.6 Sol or Sonar Reasoning Pro?+
Neither has a larger sourced maximum output. GPT-5.6 Sol is 128K and Sonar Reasoning Pro is —.
Do GPT-5.6 Sol and Sonar Reasoning Pro support reasoning and tool use?+
GPT-5.6 Sol: reasoning, tool calling, and image input. Sonar Reasoning Pro: reasoning. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.6 Sol or Sonar Reasoning Pro?+
GPT-5.6 Sol has 2 sourced provider routes; Sonar Reasoning Pro has 2, a tie.
Which offers better value, GPT-5.6 Sol or Sonar Reasoning Pro?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.