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Moonshot AI launches Kimi K3.1 Pro, halving Claude Opus 5.5 API costs

By PulseAugur Editorial · [1 sources] ·

Moonshot AI has launched its Kimi K3.1 Pro model, offering competitive API pricing that undercuts some of Anthropic's offerings. The new model is priced at $2 per 1 million input tokens and $10 per 1 million output tokens, matching Claude Sonnet 5.5 and halving the cost of Claude Opus 5.5. Kimi K3.1 Pro features a 1,048,576-token context window with flat pricing, and a faster Highspeed tier is available at double the cost. AI

IMPACT Sets a new price benchmark for large-context models, potentially driving down costs for API users.

RANK_REASON New model release from a frontier lab (Moonshot AI). [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Moonshot AI launches Kimi K3.1 Pro, halving Claude Opus 5.5 API costs

How we ranked this

Signal score
61 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
New model release from a frontier lab (Moonshot AI). [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
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AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Tokely — AI API Platform ·

    Kimi K3.1 Pro API Pricing: Half of Claude Opus 5.5, Same as Sonnet 5.5

    <p><strong>Short answer:</strong> Moonshot AI released Kimi K3.1 Pro at $2 per 1M input tokens and $10 per 1M output tokens. That matches Claude Sonnet 5.5 and cuts Claude Opus 5.5 pricing in half. For long prompts without tiered pricing penalties, Kimi K3.1 Pro provides 1,048,57…

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