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Model: KikoCis/FastContext-1.0-4B-SFT Source: Original Platform
2026-07-22 20:42:46 +08:00
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+---
+license: mit
+library_name: transformers
+tags:
+- preserved
+- repository-exploration
+- subagent
+- coder
+- agentic
+- qwen3
+- 256k
+- long-context
+language:
+- en
+pipeline_tag: text-generation
+---
+
+![banner](banner.png)
+
+<div style="border:2px solid currentColor; font-family:ui-monospace,'SF Mono','Cascadia Mono',Consolas,'Liberation Mono',monospace;">
+  <div style="border-bottom:1px solid currentColor; padding:6px 12px; font-size:11px; letter-spacing:3px; text-transform:uppercase; opacity:0.7; text-align:center;">PRESERVED ORIGINAL // REMOVED BY MICROSOFT FROM HF + GITHUB // MIT</div>
+  <div style="padding:14px; display:flex; flex-wrap:wrap; align-items:center; justify-content:center; gap:18px;">
+<pre style="margin:0; flex:0 0 auto; font-family:ui-monospace,'SF Mono','Cascadia Mono',Consolas,monospace; font-size:9px; line-height:1.15; letter-spacing:0;">
+   microsoft/FastContext ──▶ 404
+   github.com/microsoft/FastContext ──▶ 404
+              │
+              ▼
+   ┌──────────────────────────┐
+   │  weights preserved here  │
+   │  bf16 · 8.0 GB · intact  │
+   └──────────────────────────┘
+     you can't un-open-source
+</pre>
+    <div style="flex:0 1 auto; max-width:100%; text-align:center;">
+      <div style="font-size:23px; font-weight:800; letter-spacing:1px;">FASTCONTEXT-1.0-4B-SFT</div>
+      <div style="font-size:12.5px; letter-spacing:1px; opacity:0.8; margin-top:5px;"><span style="white-space:nowrap;">PRESERVED ORIGINAL WEIGHTS</span> · <span style="white-space:nowrap;">QWEN3 DENSE 4B</span> · <span style="white-space:nowrap;">256K CONTEXT</span> · <span style="white-space:nowrap;">BF16 · 8.0 GB</span></div>
+    </div>
+  </div>
+  <table style="display:table; table-layout:fixed; width:100%; margin:0; border-collapse:collapse; font-family:ui-monospace,'SF Mono',Consolas,monospace; font-size:12px;">
+    <tr>
+      <td style="border-top:1px solid currentColor; border-right:1px solid currentColor; padding:8px 12px;"><div style="font-size:10px; letter-spacing:1px; opacity:0.6;">WEIGHTS</div><div style="font-weight:700;">BF16 · UNMODIFIED</div></td>
+      <td style="border-top:1px solid currentColor; border-right:1px solid currentColor; padding:8px 12px;"><div style="font-size:10px; letter-spacing:1px; opacity:0.6;">ARCH</div><div style="font-weight:700;">QWEN3 DENSE · 36L</div></td>
+      <td style="border-top:1px solid currentColor; border-right:1px solid currentColor; padding:8px 12px;"><div style="font-size:10px; letter-spacing:1px; opacity:0.6;">CONTEXT</div><div style="font-weight:700;">256K NATIVE</div></td>
+      <td style="border-top:1px solid currentColor; padding:8px 12px;"><div style="font-size:10px; letter-spacing:1px; opacity:0.6;">LICENSE</div><div style="font-weight:700;">MIT</div></td>
+    </tr>
+  </table>
+</div>
+
+> Microsoft open-sourced FastContext under MIT, then **deleted it from both HuggingFace and GitHub** about two weeks later (verified: 404 on both, 2026-07-02). MIT means preservation is legal — so here it is, unmodified. **Own your AI: a model on your disk can't be sunset by a quarterly review.**
+
+## 🔍 What it is
+
+A **repository-exploration subagent** for coding agents. Invoked on demand by your main agent, it fires **parallel read-only tool calls** (`READ` / `GLOB` / `GREP`) across a repo and returns **only the file paths + line ranges that matter**, as compact context. Your frontier coding agent stops wasting its context window (and your bill) crawling the file tree.
+
+Microsoft's (now-deleted) announcement reported **~60% fewer tokens** from the main coding agent and **+5.5% on SWE-bench** — their figures; the source no longer exists to cite.
+
+**Architecture**: plain `Qwen3ForCausalLM` dense 4B — 36 layers, 256K native context. No exotic modules; loads with standard `transformers`.
+
+## 🚀 Quick start
+
+```python
+from transformers import AutoModelForCausalLM, AutoTokenizer
+m = AutoModelForCausalLM.from_pretrained("KikoCis/FastContext-1.0-4B-SFT", torch_dtype="bfloat16", device_map="auto")
+tok = AutoTokenizer.from_pretrained("KikoCis/FastContext-1.0-4B-SFT")
+```
+
+**Don't want 8 GB?** Grab the **GGUF quants** (1.96–2.5 GB, long-context imatrix, retrieval-validated 30/30 vs this bf16):
+👉 [KikoCis/FastContext-1.0-4B-longctx-imatrix-GGUF](https://huggingface.co/KikoCis/FastContext-1.0-4B-longctx-imatrix-GGUF)
+
+## ⚠️ Good to know
+
+- It's a **scout, not a solver** — it finds and returns evidence; pair it with a main coding agent that writes the actual fix.
+- Upstream docs, harness code and issues were deleted along with the repos; usage conventions here come from the announcement and community mirrors.
+- Weights are **byte-identical** to the (re-uploaded) original — no fine-tuning, no edits.
+
+## 📚 Credit & license
+
+Model, weights, training: **© Microsoft** (MIT). This is a preservation mirror sourced via the `ShaunGves/FastContext-1.0-4B-SFT` re-upload after `microsoft/FastContext-1.0-4B-SFT` was removed. Nothing modified. Quantized companion + validation: KikoCis.