docs: add 0.2.0 changelog entry and pricing section to README

Document the incremental reasoning-delta streaming, live display pricing,
and dynamic model fetch in CHANGELOG.md. Add a Pricing section to
README.md explaining the MODEL_COSTS overlay and how to update prices.

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## 0.2.0 - 2026-05-27
+
+- Stream `reasoning-delta` events incrementally instead of buffering the full thinking block until `reasoning-end`. Emits `thinking_start`, `thinking_delta`, and `thinking_end` events as they arrive so the UI can show reasoning in real time.
+- Close open text blocks on `reasoning-start` and `reasoning-delta` so thinking and text never overlap in the output.
+- Add live display pricing (`MODEL_COSTS`) for known Command Code models. Cost falls back to zero for models not yet in the price table until the Provider API exposes pricing directly.
+- Fetch models from the Command Code Provider API at startup (inherited from upstream 0.1.1) and overlay the static cost table.
+
 ## 0.1.1 - 2026-05-26
 
 - Align Command Code generate requests with CLI `0.27.2` headers and payload shape.

README.md

@@ -115,6 +115,15 @@ https://api.commandcode.ai/provider/v1/models
 
 For tests or local mocks, override it with `COMMANDCODE_MODELS_URL`.
 
+## Pricing
+
+Command Code does not yet expose model pricing through its Provider API. The provider ships a static cost table (`MODEL_COSTS` in `index.ts`) for known models so that pi can display per-model pricing.
+
+- Models present in `MODEL_COSTS` show their real per-million-token rates (including promotional deals like the DeepSeek V4 Pro 4× discount and Qwen 3.7 Max 2× discount).
+- Models **not** in the table fall back to zero cost. When the Provider API adds a `cost` field, the static table can be removed.
+
+To add or update a price, edit the `MODEL_COSTS` record in `index.ts` and update the corresponding test in `tests/test-models.ts`.
+
 ## Contributing
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) for development setup, PR expectations, and commit message rules.

src/core.ts

@@ -263,7 +263,7 @@ export function createStreamCommandCode(deps: CoreDependencies) {
             } else {
               const tc = output.content[thinkingIdx]
               if (tc && tc.type === "thinking") {
-                (tc as { thinking: string }).thinking += delta
+                ;(tc as { thinking: string }).thinking += delta
               }
             }
             stream.push({

tests/test-pricing.ts

@@ -31,9 +31,7 @@ const entries: Record<string, { input: number; output: number }> = {}
 for (const line of costBlock.split("\n")) {
   const trimmed = line.trim()
   if (!trimmed || trimmed.startsWith("//")) continue
-  const entryMatch = trimmed.match(
+  const entryMatch = trimmed.match(/^"([^"]+)":\s*\{\s*input:\s*([\d.]+),\s*output:\s*([\d.]+)/)
-    /^"([^"]+)":\s*\{\s*input:\s*([\d.]+),\s*output:\s*([\d.]+)/,
-  )
   if (entryMatch) {
     entries[entryMatch[1]] = {
       input: Number(entryMatch[2]),
@@ -80,17 +78,13 @@ describe("MODEL_COSTS pricing overlay", () => {
     const claudeModels = ["claude-sonnet-4-6", "claude-opus-4-7"]
     for (const id of claudeModels) {
       const fullEntryMatch = costBlock.match(
-        new RegExp(`"${id.replace(/\//g, "\\\\")}":\\s*\\{[^}]+cacheRead:\\s*([\\d.]+)[^}]+cacheWrite:\\s*([\\d.]+)`),
+        new RegExp(
+          `"${id.replace(/\//g, "\\\\")}":\\s*\\{[^}]+cacheRead:\\s*([\\d.]+)[^}]+cacheWrite:\\s*([\\d.]+)`,
+        ),
       )
       assert.ok(fullEntryMatch, `"${id}" should have cacheRead and cacheWrite fields`)
-      assert.ok(
+      assert.ok(Number(fullEntryMatch[1]) > 0, `"${id}" cacheRead should be > 0`)
-        Number(fullEntryMatch[1]) > 0,
+      assert.ok(Number(fullEntryMatch[2]) > 0, `"${id}" cacheWrite should be > 0`)
-        `"${id}" cacheRead should be > 0`,
-      )
-      assert.ok(
-        Number(fullEntryMatch[2]) > 0,
-        `"${id}" cacheWrite should be > 0`,
-      )
     }
   })
 })