Kimi K2-Thinking-0905

Name: Kimi K2-Thinking-0905
Author: Moonshot AI

Moonshot AI

Kimi K2 Thinking 0905 is the September 2025 update to the reasoning-focused variant of Kimi K2. It is a large-scale Mixture-of-Experts (MoE) language model by Moonshot AI with 1 trillion parameters and 32 billion active per forward pass. The thinking variant is specifically optimized for complex reasoning, mathematical proofs, and multi-step problem solving. This update enhances agentic coding, frontend development, and supports long-context inference up to 256K tokens.

Key Specifications

Parameters

1.0T

Context

262.1K

Release Date

September 4, 2025

Average Score

92.0%

API Documentation Research Paper Repository Model Weights Results Blog

Timeline

Key dates in the model's history

Announcement / Last Update

September 4, 2025

Today

March 25, 2026

Technical Specifications

Parameters

1.0T

Training Tokens

15.5T tokens

Knowledge Cutoff

Family

Capabilities

MultimodalZeroEval

Pricing & Availability

Input (per 1M tokens)

$0.60

Output (per 1M tokens)

$2.40

Max Input Tokens

262.1K

Max Output Tokens

65.5K

Supported Features

Function CallingStructured OutputCode ExecutionWeb SearchBatch InferenceFine-tuning

Benchmark Results

Model performance metrics across various tests and benchmarks

Reasoning

Logical reasoning and analysis

GPQA

Diamond • Self-reported

84.0%

Other Tests

Specialized benchmarks

AIME 2025

Standard evaluation • Self-reported

100.0%

HMMT 2025

Standard evaluation • Self-reported

97.0%

MMLU-Redux

Without tools • Self-reported

94.0%

MMLU-Pro

Without tools • Self-reported

85.0%

License & Metadata

License

mit

Announcement Date

September 4, 2025

Last Updated

September 4, 2025

Compare Kimi K2-Thinking-0905

All comparisons

vs Kimi K2.5 vs Qwen3-235B-A22B-Thinking-2507 vs GPT-5.4 vs GPT-5 High vs Qwen3 235B A22B vs GPT-5.1 Thinking vs Qwen3.5-397B-A17B vs Gemini 3 Flash

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