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Coverage
OpenAI's April API update ships GPT-5.1 as the new default reasoning engine, with Codex variants and GPT-5.4 mini and nano tightening the grip on agentic
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Model details
GPT-5.1
GPT-5.1 is an upgrade to OpenAI's GPT-5 series, rolled out as two complementary variants: GPT-5.1 Instant, the most-used conversational model, now warmer and more playful by default while staying clear and useful, and GPT-5.1 Thinking, the advanced reasoning model designed to be easier to understand, faster on routine tasks, and more persistent on complex ones. The release emphasizes a dual focus on measurable intelligence gains and a more enjoyable communication style, addressing direct user feedback that a great assistant should be both smart and pleasant to talk to. Alongside the model upgrade, OpenAI introduced more intuitive controls for shaping ChatGPT's tone so responses can match the conversational tone a user wants from one chat to the next.
Practically, GPT-5.1 fits teams and individuals who want a flexible assistant that can shift between quick, friendly exchanges and deeper reasoning without changing tools. Instant handles day-to-day questions, brainstorming, and lightweight instructions, while Thinking is aimed at multi-step problems that benefit from sustained analysis. The tone controls make it easier to tune outputs for different audiences, from concise professional replies to more expressive creative drafts, so the same model can adapt to writing, planning, coding help, and exploratory conversation within a single workflow.
Kilo Gatewayopenai/gpt-5.1gpt
Quick Info
Powered by- Provider
- Kilo Gateway
- Model key
- openai/gpt-5.1
- Release date
- Nov 13, 2025
- Last updated
- Nov 13, 2025
- Knowledge cutoff
- 2024-09-30
- Input modalities
- Output modalities
- Capabilities
Cost
- Input token cost
- $1.25
- Output token cost
- $10.00
Limits
- Input tokens
- 272,000 tokens
- Output tokens
- 128,000 tokens
- Context window
- 400,000 tokens
Transparent token rates
Compare GPT-5.1 pricing
Rates are shown per one million tokens. Combined means one million input plus one million output tokens.
Latest news about GPT-5.1
Kilo Gateway
Coverage
Tech News News: ChatGPT-maker OpenAI has unveiled the latest version of its artificial intelligence model — GPT-5.5. the company claims that the new model comes with .
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CoverageRelease Notes
Editor’s note (April 15, 2026): We updated this post to include information about the deprecation of GPT 5.1. We have deprecated the following models across all GitHub Copilot experiences (including Copilot Chat, inline edits, ask and agent modes, and code completions) on April 1, 2026. | Model | Deprecation date | Sug
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CoverageBenchmark
Baidu's ERNIE-5.0-0110 ranks #8 globally on LMArena, becoming the only Chinese model in the top 10 while outperforming GPT-5.1-High.
302.AI
CoverageBenchmark
LLM-Stats aggregates upstream OpenAI benchmark data for the base GPT-5.1 model, citing a score of 0.96 on τ²-Bench Telecom and 0.94 on AIME 2025, both attributed to openai.com methodology. The composite LLM Stats Score places GPT-5.1 at rank 90, with quality tracker values near baseline over recent 7-day and 30-day windows. Blended price and performance-by-depth metrics are aggregator-derived and should not be treated as authoritative for any specific provider. The page lists additional benchmark coverage for GPT-5.1, including BrowseComp Long Context at the 128k setting and other capability tiers tracked by the aggregator. Performance across conversation depths shows relatively stable σ values, with chat-related tasks showing the strongest positive deviation. All cited scores trace to official OpenAI sources rather than independent measurements, so they corroborate rather than expand the model family's documented capability profile.
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