GPT-5.1 vs Solar Pro 4
At a Glance
| Compare |  GPT-5.1OpenAI |  Solar Pro 4Upstage |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #37 of 4625.7 score · 2/3 sources · provisional · missing LiveBench · full-core range 17.1–50.5 | UnrankedNot in the 46-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $1.25Openai ↗ · Sep 3, 2026 | $0.090Upstage ↗ · Sep 18, 2026 |
| Output priceFrom · USD / 1M tokens | $10.00Openai ↗ · Sep 3, 2026 | $0.36Upstage ↗ · Sep 18, 2026 |
| Context windowMaximum documented tokens | 400K | 524K |
| Model facts checked | Sep 3, 2026View model evidence → | Sep 18, 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
Side-by-Side Facts
| Field | GPT-5.1 | Solar Pro 4 |
|---|---|---|
| Developer | OpenAI | Upstage |
| Family | Gpt 5 1 | Solar Pro |
| Model | GPT-5.1 | Solar Pro 4 |
| Version | GPT-5.1 | Solar Pro 4 |
| Lifecycle | active | active |
| Released | 2025-11-13 | 2026-08-14 |
| Knowledge cutoff | 2024-09-30 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 400K | 524K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | Yes |
| Provider access | Openai (Standard), Openrouter (Standard) | Upstage (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | agents, chat, generation, reasoning, structured_outputs, tools |
| Supported languages | Unknown | English, Korean, Japanese |
| Training data cutoff | Unknown | February 2026 |
GPT-5.1 Capabilities
Solar Pro 4 Capabilities
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Primary Evidence
Sources and Freshness
Questions
GPT-5.1 vs Solar Pro 4 FAQs
Is GPT-5.1 or Solar Pro 4 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.1 and Solar Pro 4, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.1 or Solar Pro 4?+
GPT-5.1 is $1.25 and Solar Pro 4 is $0.090 per million tokens, so Solar Pro 4 is cheaper on this metric. GPT-5.1 is $10.00 and Solar Pro 4 is $0.36 per million tokens, so Solar Pro 4 is cheaper on this metric.
Which has a larger context window, GPT-5.1 or Solar Pro 4?+
Solar Pro 4 has the larger sourced context window. GPT-5.1 supports 400K and Solar Pro 4 supports 524K.
Which performs better in benchmarks, GPT-5.1 or Solar Pro 4?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.1 or Solar Pro 4 be self-hosted?+
Solar Pro 4 is the only model in this pair currently marked as self-hostable. GPT-5.1 is not marked open weight; Solar Pro 4 is not marked open weight.
Can GPT-5.1 and Solar Pro 4 understand images?+
GPT-5.1 is documented with image input; Solar Pro 4 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.1 or Solar Pro 4?+
Solar Pro 4 has the larger sourced maximum output: GPT-5.1 supports 128K and Solar Pro 4 supports 131K output tokens.
Do GPT-5.1 and Solar Pro 4 support reasoning and tool use?+
GPT-5.1: reasoning, tool calling, and image input. Solar Pro 4: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.1 or Solar Pro 4?+
GPT-5.1 has 2 sourced provider routes; Solar Pro 4 has 1, so GPT-5.1 has broader tracked availability.
Which offers better value, GPT-5.1 or Solar Pro 4?+
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.