Model

Spark-X2.6-4B

OPEN

iFlytek · Spark (Xinghuo) family · released Oct 20, 2026

iFlytek's open-weight on-device model, released by its SparkLLM (XHToken) team on Hugging Face on Oct 20, 2026 (the GitHub release log dates the global launch Oct 21) and presented again at iFlytek's 1024 Developer Festival on Oct 22 alongside the cloud Spark X2.6. It keeps Spark-X2.5-4B's architecture and gains through post-training; a base checkpoint ships separately. Scores are SparkLLM's with thinking set to high. NOT FILED: BFCL-V4 (71.8; corpus has only bfcl and bfcl-v3, and V4 is a different task version) and AA-LCR v1.1 (67.3; no corpus column). Spark-X2.5-4B (Sep 1, 2026) predates this routine and is not in the corpus.

ReasoningCodingVisionFunction callingTool useAgentic

1760.2

Elo · rank #119

Parameters

Active params

4B (dense)

Context

1.024M tokens

Architecture

4B-parameter on-device language model with the same architecture as Spark-X2.5-4B (Spark2_5ForCausalLM; layer layout not described on the card); 1,048,576-token context; thinking levels none, low and high

License

Apache-2.0

Languages

—

API price (in/out)

No hosted API

Modalities

text

Benchmark results

Bar shows position within the tracked field; marker = field best

BrowseCompAgents53.1%#37

best: Kimi K3.1 Pro · 92.1%

MCP AtlasAgents62.4%#9

best: Muse Spark Open · 89.2%

SWE-bench ProCoding54.3%#41

best: Claude Opus 5.5 · 89.9%

SWE-bench VerifiedCoding62.8%#96

best: Claude Opus 5 · 97.0%

Run it locally

VRAM @ Q4

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VRAM @ FP16

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Fits on (Q4)

Multi-node cluster required

Throughput data unavailable.

Quantizations

GGUF

Fine-tune it

Permissive

QLoRA4.5 GB1× RTX 3060 12GB

LoRA10.3 GB1× RTX 3060 12GB

Full fine-tune66.0 GB1× A100 80GB

QLoRA SFT on ~10k samples ≈ $2.34 (1× RTX 3060 12GB)

Plan a fine-tune →

Spark (Xinghuo) family

Elo progression across releases

iFlytek Spark V1.0 (Xinghuo)May 20231000.0 iFlytek Spark V3.0 (Xinghuo)Oct 2023991.1 iFlytek Spark V4.0 (Xinghuo)Jun 20241000.0 iFlytek Spark X1 (Xinghuo X1)Jan 20251351.3 Spark-X2.6-4BOct 20261760.2 iFlytek Spark X2.6 (Xinghuo X2.6)Oct 20261000.0

Resources

HFXHToken/Spark-X2.6-4B DOCShttps://github.com/XHToken/Spark-X2.6

API price weights · each benchmark row carries its own source badge (see methodology)