Kimi K3.1 Pro vs GPT-5 Nano
Compare Kimi K3.1 Pro and GPT-5 Nano side-by-side. See comparisons of price, response speed, accuracy, and file support to choose the best model for your task.
Overview
Kimi K3.1 Pro vs GPT-5 Nano Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
Kimi / Kimi K3.1 Pro
proDescription
Moonshot AI's newest flagship and the first model in its K3.1 series, built as a post-trained upgrade to Kimi K3. Moonshot reports Terminal-Bench 4.0 results just behind Claude Opus 5.5, a top OfficeQA Pro v2 score, and far fewer factual errors than K3. It reads text and images across a very large context and reasons before answering. Moonshot is releasing open weights.
OpenAI / GPT-5 Nano
lightDescription
OpenAI's smallest and cheapest GPT-5 model, built for speed above all. GPT-5 Nano is made for summarisation, classification, and other well-defined tasks that run at high volume. It reads text and images, with adjustable reasoning effort. Reasoning depth is shallow by design and its knowledge is dated. The trade is cost: it is among the cheapest models in the catalog.
About
About
Capabilities
Capabilities
Comparison
Why Use Kimi K3.1 Pro and GPT-5 Nano?
Aymo gives you more than access to individual models—it provides a complete multi-model AI workspace designed for productivity.
Kimi / Kimi K3.1 Pro
proClose To Opus 5.5
Moonshot reports 65.7% on Terminal-Bench 4.0, just behind Claude Opus 5.5 at 66.4% and ahead of GPT-6 Astra at 58.2%. These are Moonshot's own results.
Reasoning Built In
Reasons through each request before it replies. Moonshot reports 61.2% on its long-horizon coding test, up from 55.95% for Kimi K3, after much larger post-training.
Room For Long Inputs
A very large context window of about 1 million tokens, according to Moonshot. Load a full repository, long filings, or a research set in one request.
Finance And Office Work
Moonshot reports a top score of 64.4 on OfficeQA Pro v2, and a rise in Financial Research from 58.8 to 70.4 over Kimi K3 on its internal tests.
Fewer Factual Errors
On Moonshot's hardest accuracy test, claim-level errors fell from 23.4% with Kimi K3 to 8.3%. It has no native web search, so current data comes through connected tools.
Text And Image Input
Reads text and images on Aymo. Moonshot also built it for 3D work from sketches and reference images, scoring 72.8 on BenchCAD without tools, level with Claude Opus 5.5.
OpenAI / GPT-5 Nano
lightCoding Sub-Tasks
Suited to small, well-scoped coding jobs and to acting as a fast sub-agent inside a larger system, rather than tackling whole problems. Reasoning depth is limited, so keep the scope tight.
Adjustable Reasoning Effort
Reasoning effort runs from minimal through low, medium, and high. Even at higher effort it is a shallow reasoner by design, so it suits speed-sensitive work rather than hard multi-step problems.
Room For Long Documents
A large context window, enough to summarise long reports or classify big batches of text in a single pass without splitting the input into separate requests.
Summarisation And Classification
OpenAI names summarisation and classification as its core uses. Built to process high volumes of text quickly and cheaply rather than to produce polished long-form writing.
Analysis On Older Knowledge
Its training data is dated by current standards, so it is fine for processing text you supply but weaker on recent events, which need live sources rather than the model's own knowledge.
Text And Image Input
Reads text and images, so you can send screenshots or scanned pages alongside your prompt. Output is text only. OpenAI states audio and video are not supported.
Why Aymo
Why chat with Kimi K3.1 Pro and GPT-5 Nano on Aymo AI?
Aymo gives you more than access to Kimi K3.1 Pro and GPT-5 Nano—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
See how Kimi K3.1 Pro and GPT-5 Nano performs alongside Claude, Gemini, Grok, and other leading AI models.
One Workspace
Keep all your AI conversations, files, and prompts in a single organized workspace.
Switch Models Instantly
Move between different AI models without restarting your conversation.
Upload Once
Use the same files across multiple AI models without uploading them again.
Save & Organize
Bookmark important chats, organize projects, and return anytime.
Work Together
Share conversations and collaborate with teammates in one place.