Reka

Reka Flash 3.1

Name: Reka Flash 3.1
Author: Reka

Reka Flash 3.1 is a Reka model with 98K context, Not verified in / Not verified out per million tokens, last verified October 25, 2026. Open weights: yes. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.

Reka Flash 3.1 is Reka's open-weight Apache 2.0 21B text reasoning checkpoint.

Recorded profile verification October 25, 2026Individual provider fields may change

AI model specification details
Specification	Reka Flash 3.1
Provider	Reka
Tier	Balanced
Context window	98K
Max output	Not verifiedUnverified
Input / 1M tokens	Not verifiedUnverified
Output / 1M tokens	Not verifiedUnverified
Weights	Open
Parameters	21B
Reasoning levels	Not verifiedUnverified
Modalities	text
License	Apache 2.0
Released	July 10, 2025

Pricing tiers: Downloadable Apache 2.0 21B checkpoint with self-hosting costs and 98,304 configured positions. The current hosted list names reka-flash-3 with rounded 64k context, not this exact 3.1 checkpoint. Current pricing docs direct callers to the model catalog or authenticated GET /v1/models for USD-per-token pricing strings; no exact current 3.1 endpoint mapping or hosted tariff is established. Do not inherit an older unversioned Flash quote.

Best for

Self-hosted text reasoning
Fine-tuning for coding
Agentic research

Watch out

The 98,304-position checkpoint config is separate from a hosted API context contract. No independent hard output cap, hosted API ID or effort enum is verified. Use the card's human role and <sep> separator, prepend system content to the first user turn, and strip earlier reasoning in multi-turn prompts. English is the primary language; support for other languages is partial. Do not inherit an unversioned hosted Flash price, multimodal capability or Flash 3 benchmark estimate.

Source receipts

Catalog figures for this model were checked against the following sources.

Reka exact checkpoint card and prompt format (accessed 2026-10-25)
Reka raw README declares Apache 2.0 (accessed 2026-10-25)
Reka exact 98,304-position configuration (accessed 2026-10-25)
Reka dated Flash 3.1 release (accessed 2026-10-25)
Reka current unversioned hosted IDs (accessed 2026-10-25)
Reka hosted pricing, checkpoint mapping unverified (accessed 2026-10-25)

Common questions

Reka Flash 3.1

Answered from the verified figures on this page rather than general guidance.

What is Reka Flash 3.1's context window?

Reka Flash 3.1 accepts about 98K tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.

What is Reka Flash 3.1 best for?

Reka Flash 3.1 is a balanced tier from Reka. It suits self-hosted text reasoning, fine-tuning for coding, agentic research. The 98,304-position checkpoint config is separate from a hosted API context contract. No independent hard output cap, hosted API ID or effort enum is verified. Use the card's human role and <sep> separator, prepend system content to the first user turn, and strip earlier reasoning in multi-turn prompts. English is the primary language; support for other languages is partial. Do not inherit an unversioned hosted Flash price, multimodal capability or Flash 3 benchmark estimate.

Can I self-host Reka Flash 3.1?

Reka Flash 3.1 publishes open weights, but self-hosting depends on the licence, hardware footprint, quantisation quality, and serving stack. A hosted API is often cheaper until you have measured throughput and concurrency on your own hardware.

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