GPT-6.1 Sol (Fast)

GPT-6.1 Sol is an upgraded successor to GPT-6 Sol in OpenAI's GPT-6 generation lineup, positioned as a mid-tier model that approaches the flagship GPT-6 Astra on coding, computer use, and professional workflows while charging roughly one-fifth of Astra's standard input and output token prices. This positioning makes it a practical choice for teams that need strong coding and agentic capability without paying flagship rates, and it reflects OpenAI's broader strategy of offering differentiated price-performance tiers within a single generation, alongside siblings like GPT-6 Luna and GPT-6 Astra.

A defining feature of the GPT-6.1 Sol release is OpenAI's new Ultrafast premium inference tier, which delivers up to eight times faster token generation in Codex and up to six times faster in the API, reaching as much as 300 tokens per second. That speed profile, combined with the model's near-Astra benchmark alignment, makes the Fast variant particularly well-suited for latency-sensitive coding assistants, interactive agent loops, and high-throughput professional tooling where both responsiveness and reliable reasoning quality matter.

Vercel AI Gatewayopenai/gpt-6.1-sol-fastgpt-sol

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Quick Info

Provider: Vercel AI Gateway
Model key: openai/gpt-6.1-sol-fast
Release date: Sep 29, 2026
Last updated: Sep 29, 2026
Knowledge cutoff: 2026-04-30
Input modalities
Output modalities
Capabilities

Cost

Input token cost: $4.00
Output token cost: $20.00

Limits

Input tokens: 922,000 tokens
Output tokens: 128,000 tokens
Context window: 1,050,000 tokens

Latest news about GPT-6.1 Sol (Fast)

Vercel AI Gateway

Coverage

This CometAPI comparison frames GPT-6.1 Sol as a capability upgrade over GPT-6 Sol, keeping the same 1,050,000-token context window and 128,000-token maximum output while improving coding, computer use, and agent reliability. The piece is third-party reseller content, not OpenAI documentation, and does not reference Vercel AI Gateway. Base API pricing remains unchanged at $2 per million input and $10 per million output tokens, but prompt caching is halved from $0.20 to $0.10 per million cached input tokens. The article highlights gains in long-horizon coding, factual reliability, and professional-document handling, positioning the upgrade as more useful output per token rather than a reshaping of the API surface.

Vercel AI Gateway

Coverage

OpenAI unveiled GPT-6.1 Sol at DevDay, positioning it as delivering near-Astra intelligence for coding, computer use, and professional work at roughly one-fifth of GPT-6 Astra's API cost. The model is attributed to OpenAI; the article does not address Vercel AI Gateway specifics. Family-level evidence applies to the GPT-6.1 Sol Fast alias. According to Artificial Analysis's Intelligence Index, GPT-6.1 Sol reaches 52 points at maximum reasoning effort — four points above its GPT-6 Sol predecessor and one point below GPT-6 Astra, placing it tenth among 222 tested models. API pricing is $2 per million input tokens and $10 per million output tokens, with cached input at $0.10 per million tokens and a context window exceeding one million tokens.