Overview
GPT-6.1 Sol Pro is the same underlying model as [GPT-6.1 Sol](https://openrouter.ai/openai/gpt-6.1-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Our take
For users tackling complex research or writing projects, OpenAI: GPT-6.1 Sol Pro offers a specialised approach. Unlike its sibling, GPT-6.1 Sol, which can be configured for various reasoning modes, this Pro version defaults to a 'pro' reasoning mode to deliver higher-quality responses on intricate tasks. This is further supported by a substantial 1,050,000-token context window, which is larger than many comparable models, allowing for extensive input data. The inclusion of vision capabilities means it can process image inputs, and its support for tool and function calling facilitates agent-style workflows. While it includes built-in reasoning for harder problems, it also carries an above-average API pricing of $2 per 1M input tokens. This makes it ideal for developers or researchers who require advanced analytical capabilities and are working with extensive datasets, but for whom cost is a secondary concern.
How OpenAI: GPT-6.1 Sol Pro stacks up
Among the 378 chatbots & llms tools in our directory, it ranks #3 of 373 on quality (9.2/10), 15% above the 373-tool average of 8.0, and its $2/1M input-token rate is in the premium end — 3% pricier than the 362-model average of $1.94/1M.
Weighing quality against cost, OpenAI: GPT-6.1 Sol Pro's cost-per-quality-point of $0.22 places it at #272 of 353 for value among chatbots & llms tools.
OpenAI: GPT-6.1 Sol Pro in depth
OpenAI: GPT-6.1 Sol Pro, built by OpenAI, sits in the chatbots & llms space and is a paid tool starting at $2.00/1M tokens. Our editors rate it 9.2 out of 10 based on capability, ecosystem and value. It handles a context window of 1,050,000 tokens.
On the feature side, OpenAI: GPT-6.1 Sol Pro brings 1,050,000-token context window, vision (image input), reasoning / chain-of-thought and tool / function calling. These are the capabilities that most shape day-to-day use and separate it from thinner alternatives.
Its biggest strength is large 1,050,000-token context window, bigger than most models listed here, while the main trade-off to weigh is that above-average api pricing ($2 per 1m input tokens). Keep both in mind when deciding whether it fits your workflow.
OpenAI: GPT-6.1 Sol Pro is most often chosen for research and writing. If that matches your goals, it's a strong candidate to shortlist.
Key features
- ✓1,050,000-token context window
- ✓Vision (image input)
- ✓Reasoning / chain-of-thought
- ✓Tool / function calling
- ✓Structured (JSON) outputs
Pricing
Pros
- +Large 1,050,000-token context window, bigger than most models listed here
- +Built-in reasoning (chain-of-thought) mode for harder problems
- +Accepts images as input (vision-capable)
- +Supports tool / function calling for agent-style workflows
Cons
- −Above-average API pricing ($2 per 1M input tokens)
Who should use OpenAI: GPT-6.1 Sol Pro
- →Anyone looking for a chatbots & llms tool from OpenAI.
- →Teams and individuals focused on research and writing.
- →People who value large 1,050,000-token context window, bigger than most models listed here.
- →Workflows that need a 1,050,000 tokens context window.
Who should look elsewhere
- →Anyone who needs a free tier — this tool is paid only.
- →Those for whom above-average api pricing ($2 per 1m input tokens) is a dealbreaker.
Best for
10 Best OpenAI: GPT-6.1 Sol Pro Alternatives in 2026
OpenAI: GPT-6.1 Sol Pro is a strong chatbots & llms tool, but it is not the only option. Whether you are after a lower price, different features or a better fit for your workflow, here are the 10 best alternatives to OpenAI: GPT-6.1 Sol Pro, ranked and compared.
Anthropic
Claude is Anthropic's family of AI assistants, known for long-context reasoning, careful writing and strong coding…
OpenAI
ChatGPT is OpenAI's flagship conversational AI, powering hundreds of millions of weekly users across web, mobile and…
Google DeepMind
Gemini is Google's natively multimodal model family, deeply integrated across Search, Workspace, Android and the Pixel…
OpenAI
GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series.
Anthropic
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a…
Fireworks
Ember-1 is a specialized reasoning model from Fireworks Research, built on [Kimi…
Qwen
Qwen3.8 Max Prime is a higher-throughput variant of Qwen3.8 Max from Alibaba's Qwen team, served as a separate SKU at a…
Stealth
Space Bunny Alpha is an anonymous large model with blazing-fast inference, strong coding capabilities and native…
OpenAI
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-6-luna), served with…
OpenAI
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.
OpenAI: GPT-6.1 Sol Pro vs top alternatives
A side-by-side look at how OpenAI: GPT-6.1 Sol Pro stacks up against its closest rivals.
| Feature | OpenAI: GPT-6.1 Sol ProOpenAI | ClaudeAnthropic | ChatGPTOpenAI | GeminiGoogle DeepMind |
|---|---|---|---|---|
| Quality score | 9.2 / 10 | 9.6 / 10 | 9.5 / 10 | 9.2 / 10 |
| Starting price | $2.00/1M tokens | $20/mo | $20/mo | $20/mo |
| Free tier | No | Yes — Free tier available | Yes — Free tier available | Yes — Free tier available |
| API input price | $2 / 1M tokens | $2 / 1M tokens | $2 / 1M tokens | $0.75 / 1M tokens |
| API output price | $10 / 1M tokens | $10 / 1M tokens | $10 / 1M tokens | $3.75 / 1M tokens |
| Speed | — | Fast | Fast | Fast |
| Context window | 1,050,000 tokens | 200K tokens | 128K tokens | 1M-2M tokens |
| Categories | Chatbots & LLMs | Chatbots & LLMs, Coding, Writing | Chatbots & LLMs, Coding, Writing | Chatbots & LLMs, Coding, Writing |
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Frequently asked questions
Q. Is OpenAI: GPT-6.1 Sol Pro free?
No — OpenAI: GPT-6.1 Sol Pro is a paid tool, starting at $2.00/1M tokens.
Q. How much does OpenAI: GPT-6.1 Sol Pro cost?
OpenAI: GPT-6.1 Sol Pro starts at $2.00/1M tokens. API usage is around $2 per 1M input tokens and $10 per 1M output tokens.
Q. What is OpenAI: GPT-6.1 Sol Pro best for?
OpenAI: GPT-6.1 Sol Pro is best suited to research and writing, within the chatbots & llms category.
Q. What are the best OpenAI: GPT-6.1 Sol Pro alternatives?
Popular alternatives to OpenAI: GPT-6.1 Sol Pro include Claude, ChatGPT, Gemini and OpenAI: GPT-6.1 Sol. Each trades off price, quality and ecosystem differently.
Q. Is there a free alternative to OpenAI: GPT-6.1 Sol Pro?
Yes. Claude, ChatGPT, Gemini offer a free tier, making them good starting points if you want to avoid an upfront subscription.
Q. Why switch from OpenAI: GPT-6.1 Sol Pro?
Common reasons include pricing, specific feature gaps (Above-average API pricing ($2 per 1M input tokens)), data-privacy requirements, or simply wanting a tool that fits your stack better.
How we rate AI tools
Our quality score weighs capability on real tasks, breadth of features and integrations, pricing and value, and how actively the tool is maintained. Scores are editorial guidance, not benchmarks — always trial a tool on your own workflow before committing. Pricing and features change frequently, so verify current details on the official site.
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