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fix(cli): /model picker honors provider-specific context caps (#16030)

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`_apply_model_switch_result` (the interactive `/model` picker's
confirmation path) printed `ModelInfo.context_window` straight from
models.dev, which reports the vendor-wide value (1.05M for gpt-5.5 on
openai). ChatGPT Codex OAuth caps the same slug at 272K, so the picker
showed 1M while the runtime (compressor, gateway `/model`, typed
`/model <name>`) correctly used 272K — the classic 'sometimes 1M,
sometimes 272K' mismatch on a single model.

Both display paths now go through `resolve_display_context_length()`,
matching the fix that `_handle_model_switch` received earlier.

Also bump the stale last-resort fallback in DEFAULT_CONTEXT_LENGTHS
(`gpt-5.5: 400000 -> 1050000`) to match the real OpenAI API value; the
272K Codex cap is already enforced via the Codex-OAuth branch, so the
fallback now reflects what every non-Codex probe-miss should see.

Tests: adds `test_apply_model_switch_result_context.py` with three
scenarios (Codex cap wins, OpenRouter shows 1.05M, resolver-empty falls
back to ModelInfo). Updates the existing non-Codex fallback test to
assert 1.05M (the correct value).

## Validation
| path                          | before    | after     |
|-------------------------------|-----------|-----------|
| picker -> gpt-5.5 on Codex    | 1,050,000 | 272,000   |
| picker -> gpt-5.5 on OpenAI   | 1,050,000 | 1,050,000 |
| picker -> gpt-5.5 on OpenRouter | 1,050,000 | 1,050,000 |
| typed /model gpt-5.5 on Codex | 272,000   | 272,000   |
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Teknium 2026-04-26 05:43:31 -07:00 • committed by GitHub
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cli.py
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@ -5153,27 +5153,29 @@ class HermesCLI:
_cprint(f" ✓ Model switched: {result.new_model}")
_cprint(f" Provider: {provider_label}")
# Context: always resolve via the provider-aware chain so Codex OAuth,
# Copilot, and Nous-enforced caps win over the raw models.dev entry
# (e.g. gpt-5.5 is 1.05M on openai but 272K on Codex OAuth).
mi = result.model_info
try:
from hermes_cli.model_switch import resolve_display_context_length
ctx = resolve_display_context_length(
result.new_model,
result.target_provider,
base_url=result.base_url or self.base_url or "",
api_key=result.api_key or self.api_key or "",
model_info=mi,
)
if ctx:
_cprint(f" Context: {ctx:,} tokens")
except Exception:
pass
if mi:
if mi.context_window:
_cprint(f" Context: {mi.context_window:,} tokens")
if mi.max_output:
_cprint(f" Max output: {mi.max_output:,} tokens")
if mi.has_cost_data():
_cprint(f" Cost: {mi.format_cost()}")
_cprint(f" Capabilities: {mi.format_capabilities()}")
else:
try:
from agent.model_metadata import get_model_context_length
ctx = get_model_context_length(
result.new_model,
base_url=result.base_url or self.base_url,
api_key=result.api_key or self.api_key,
provider=result.target_provider,
)
_cprint(f" Context: {ctx:,} tokens")
except Exception:
pass
cache_enabled = (
(base_url_host_matches(result.base_url or "", "openrouter.ai") and "claude" in result.new_model.lower())