GPT-6 Astra vs Solar Pro 4
At a Glance
| Compare |  GPT-6 AstraOpenAI |  Solar Pro 4Upstage |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #6 of 4684.4 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #41 of 44$0.520 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #27 of 3849.2 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Openai ↗ · Sep 4, 2026 | $0.090Upstage ↗ · Sep 18, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Openai ↗ · Sep 4, 2026 | $0.36Upstage ↗ · Sep 18, 2026 |
| Context windowMaximum documented tokens | 1,050K | 524K |
| Model facts checked | Sep 4, 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-6 Astra | Solar Pro 4 |
|---|---|---|
| Developer | OpenAI | Upstage |
| Family | Gpt 6 | Solar Pro |
| Model | GPT-6 Astra | Solar Pro 4 |
| Version | GPT-6 Astra | Solar Pro 4 |
| Lifecycle | active | active |
| Released | 2026-09-03 | 2026-08-14 |
| Knowledge cutoff | 2026-04-30 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,050K | 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, computer-use, generation, reasoning, research, tools | agents, chat, generation, reasoning, structured_outputs, tools |
| Supported languages | Unknown | English, Korean, Japanese |
| Training data cutoff | Unknown | February 2026 |
GPT-6 Astra Capabilities
Solar Pro 4 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-6 AstraOpenAI | cross-developer peersimage, text |
 Gemini 3.1 ProGoogle DeepMind | vs | GPT-6 AstraOpenAI | cross-developer peerstext |
 DeepSeek-V4.1-FlashDeepSeek | vs | GPT-6 AstraOpenAI | cross-developer peersimage, text |
GPT-6 AstraOpenAI | vs | Grok 4.6xAI | cross-developer peersimage, text |
GPT-6 AstraOpenAI | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
 Kimi-K3Moonshot AI | vs | GPT-6 AstraOpenAI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | GPT-6 AstraOpenAI | cross-developer peersimage, text |
GPT-6 AstraOpenAI | vs |  GLM-5.3Z.ai | cross-developer peerstext |
GPT-6 AstraOpenAI | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs | GPT-6 AstraOpenAI | cross-developer peersimage, text |
 Mistral Large 3Mistral AI | vs | GPT-6 AstraOpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-6 Astra vs Solar Pro 4 FAQs
Is GPT-6 Astra or Solar Pro 4 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-6 Astra and Solar Pro 4, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-6 Astra or Solar Pro 4?+
GPT-6 Astra is $10.00 and Solar Pro 4 is $0.090 per million tokens, so Solar Pro 4 is cheaper on this metric. GPT-6 Astra is $50.00 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-6 Astra or Solar Pro 4?+
GPT-6 Astra has the larger sourced context window. GPT-6 Astra supports 1,050K and Solar Pro 4 supports 524K.
Which performs better in benchmarks, GPT-6 Astra 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-6 Astra or Solar Pro 4 be self-hosted?+
Solar Pro 4 is the only model in this pair currently marked as self-hostable. GPT-6 Astra is not marked open weight; Solar Pro 4 is not marked open weight.
Can GPT-6 Astra and Solar Pro 4 understand images?+
GPT-6 Astra 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-6 Astra or Solar Pro 4?+
Solar Pro 4 has the larger sourced maximum output: GPT-6 Astra supports 128K and Solar Pro 4 supports 131K output tokens.
Do GPT-6 Astra and Solar Pro 4 support reasoning and tool use?+
GPT-6 Astra: 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-6 Astra or Solar Pro 4?+
GPT-6 Astra has 2 sourced provider routes; Solar Pro 4 has 1, so GPT-6 Astra has broader tracked availability.
Which offers better value, GPT-6 Astra 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.