iFlytek · Spark X2.5
Spark-X2.5-4B
Small open-weight (Apache-2.0) iFlytek on-device model with a native 1M-token context, aimed at local agent and coding use; a 1.7B sibling was released alongside.
- AA Intelligence
- —
- Price
- Self-host
- Output speed
- —
- Context window
- 1.05M tokens
Coding
- SWE-bench Pro#27 of 3144.4%
Leader: Claude Opus 5.5 at 89.9%
- SWE-bench Verified#15 of 1641.6%
Leader: Claude Sonnet 5 at 85.2%
- SciCode#82 of 9434.7%
Leader: Claude Opus 5.5 at 66.9%
Agents and tool use
- τ²-Bench#35 of 8875.1%
Leader: GLM-5.2 at 99.1%
- BrowseComp#12 of 1440.9%
Leader: GPT-6 Astra at 91.5%
- MCP Atlas#9 of 954.6%
Leader: Kimi K3 at 84.2%
Reasoning and knowledge
- AIME 2026#7 of 1390.7%
Leader: ERNIE 5.1 at 99.6%
- HMMT February 2026#6 of 881.2%
Leader: GLM-5.2 at 92.5%
- GPQA Diamond#102 of 14267.4%
Leader: GPT-6 Astra at 96.1%
- Humanity’s Last Exam#86 of 14712.3%
Leader: Claude Opus 5.5 at 61.4%
Vision and long context
- AA Long Context Reasoning#87 of 13956.3%
Leader: Kimi K3 at 88.7%
Other published results
| Result | Score | Reported by | Source |
|---|---|---|---|
| BFCL-V4 | 65.1% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| tau3-bench | 30.4% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| MCP-Mark | 14.2% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| Workspace Bench | 31.2% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| VitaBench 2.0 | 25.2% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| SWE-bench Multilingual | 53.3% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| IMO-AnswerBench | 74.2% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| IFEval | 93% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| IFBench | 75% | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |
| Gaokao 2026 (5 papers) | 133.4 points out of 150 | vendor | Hugging Face: XHToken/Spark-X2.5-4B (model card) ↗ |