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OpenAI

GPT 6

gpt-6.1-sol

OpenAI's GPT-6 family of text models, layered by task difficulty: Astra targets the hardest end-to-end tasks, while Sol balances strong reasoning with everyday cost, with enhanced coding, math, and agentic workflows

Context window
1,050,000
Input
Max output
128,000 tokens
Knowledge cutoff
2026-04-30
Reasoning Tools Streaming Structured JSON

Pricing

gpt-6.1-sol /1M tokens

Specifications Unit Price
Input $0.500
Cached input $0.025
Output $2.500
Cache write (5 min) $0.625

Overview

Positioning Overview

gpt-6.1-sol is a text model in the gpt-6 series that balances reasoning capability with everyday invocation cost, positioned in the middle tier of the lineup: it can handle complex text tasks that require multi-step judgment, and it is also suitable as the default choice for routine development and content workflows. It excels at complex coding, mathematical reasoning, and agentic multi-step workflows, and its output is plain text. It is suited to developers who need to strike a balance between quality and invocation volume, for feature development, code review, research summaries, article drafting, and batch transaction processing.

Key Highlights

  • The tier that balances reasoning and cost within the series — the gpt-6 family has a clear tier structure, and sol targets everyday complex tasks, so you do not need to invoke the flagship-tier model for every request.
  • Built for multi-step agentic tasks — its capabilities cover procedural work such as operating computers and browsers, and it can support the chained execution of automated transactions.
  • Prompt caching reuses context — calls with repeated context can use the caching mechanism to reduce redundant overhead, which benefits multi-round iterative scenarios.

Capability Description

Complex coding and in-codebase development: it can complete feature development and code review within small codebases; developers receive merge-ready change suggestions and review comments rather than mere snippet completion.

Mathematics and analysis requiring judgment: for mathematical and analytical tasks that require a reasoning process, it outputs explainable conclusions, making it easy to plug into reporting, evaluation, or decision-support workflows.

Multi-step agentic workflows: it can decompose tasks into and execute the procedures for operating computers and browsers, and developers can orchestrate it into the intermediate stages of automated transactions.

Context reuse and iteration: prompt caching is friendlier to repeated context and can reduce redundant computation in multi-round iterations and long workflow calls, making it suitable for development scenarios that require repeated refinement of outputs.

Applicable Scenarios

  • Developers reviewing changes in small codebases — input feature requirements or code to be reviewed, and receive change proposals and review comments for direct use in pre-commit code quality checks.
  • Researchers writing research summaries — input clear questions and key points from materials, and produce structured research summaries for internal reports or first drafts of material compilations.
  • Content teams drafting articles based on a brief — input a writing brief and constraints, and produce an editable article draft that enters the editing and publishing workflow.
  • Operations automating multi-step transactions — input workflow goals and intermediate states, and the model chains the steps together to complete transactions such as form filling, food ordering, and job applications, reducing manual step-by-step operation.

Limitations and Selection Advice

The gpt-6 family includes multiple variants such as Astra, Sol, and Luna, and selection should match task difficulty and invocation frequency: the most difficult end-to-end tasks are better suited to the flagship tier, and high-concurrency focused tasks are better suited to the lightweight tier; using sol for all requests may affect cost or results. The model is closed-source, so you cannot deploy it yourself or modify its weights; the actual availability of agentic capabilities such as operating computers and browsers depends on the specific product and interface support. If you need an extremely lightweight or self-hostable solution, you should choose another model.

  • New model gpt-6-astra model now available
  • New model New model gpt-6.1-sol is now available
  • Parameter change gpt-6.1-sol API contract parameter update

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