cost subcommand

[Cedric / ViaDézo1er (viadezo1er)]

Rebased on cedric/prune-profiles to dogfood.
#274 will be merged before this pr.

bt cost logs:

7 cost groups in BT Staging / cedric-traces
2026-07-14T01:35:49Z to 2026-07-21T01:35:49Z

Model                        Purpose    Cost       Coverage     Sources                          
claude-opus-4-8              default    $48.40     430/430      Braintrust 430                   
zai-org/GLM-5.2              default    $45.49     2267/2267    Braintrust 2267, no usage 272    
gpt-5.5                      default    $32.57     705/705      Braintrust 705, no usage 9       
gpt-5.6-sol                  default    $14.97     741/741      Braintrust 741, no usage 11      
claude-haiku-4-5-20251001    default    $0.339     50/50        Braintrust 50                    
<missing>                    default    unknown    0/4          —                                
glm-5.2                      default    unknown    0/1749       no usage 11                      

Total: ~$141.76  1753 unpriced token spans  303 without cost or usage

bt cost logs --json|jq:

{
  "project": "cedric-traces",
  "org": "BT Staging",
  "currency": "USD",
  "since": "2026-07-14T01:35:29Z",
  "until": "2026-07-21T01:35:29Z",
  "excludes_scorers": false,
  "pricing_file": null,
  "rows": [
    {
      "model": "claude-opus-4-8",
      "purpose": null,
      "candidate_spans": 430,
      "cost": 48.40370225,
      "braintrust_cost": 48.40370225,
      "file_cost": null,
      "braintrust_priced_spans": 430,
      "file_priced_spans": 0,
      "unpriced_token_spans": 0,
      "no_usage_spans": 0,
      "coverage": "full"
    },
    {
      "model": "zai-org/GLM-5.2",
      "purpose": null,
      "candidate_spans": 2539,
      "cost": 45.48671468,
      "braintrust_cost": 45.48671468,
      "file_cost": null,
      "braintrust_priced_spans": 2267,
      "file_priced_spans": 0,
      "unpriced_token_spans": 0,
      "no_usage_spans": 272,
      "coverage": "full"
    },
    {
      "model": "gpt-5.5",
      "purpose": null,
      "candidate_spans": 714,
      "cost": 32.5653,
      "braintrust_cost": 32.5653,
      "file_cost": null,
      "braintrust_priced_spans": 705,
      "file_priced_spans": 0,
      "unpriced_token_spans": 0,
      "no_usage_spans": 9,
      "coverage": "full"
    },
    {
      "model": "gpt-5.6-sol",
      "purpose": null,
      "candidate_spans": 752,
      "cost": 14.96779075,
      "braintrust_cost": 14.96779075,
      "file_cost": null,
      "braintrust_priced_spans": 741,
      "file_priced_spans": 0,
      "unpriced_token_spans": 0,
      "no_usage_spans": 11,
      "coverage": "full"
    },
    {
      "model": "claude-haiku-4-5-20251001",
      "purpose": null,
      "candidate_spans": 50,
      "cost": 0.33857415,
      "braintrust_cost": 0.33857415,
      "file_cost": null,
      "braintrust_priced_spans": 50,
      "file_priced_spans": 0,
      "unpriced_token_spans": 0,
      "no_usage_spans": 0,
      "coverage": "full"
    },
    {
      "model": null,
      "purpose": null,
      "candidate_spans": 4,
      "cost": null,
      "braintrust_cost": null,
      "file_cost": null,
      "braintrust_priced_spans": 0,
      "file_priced_spans": 0,
      "unpriced_token_spans": 4,
      "no_usage_spans": 0,
      "coverage": "unknown"
    },
    {
      "model": "glm-5.2",
      "purpose": null,
      "candidate_spans": 1760,
      "cost": null,
      "braintrust_cost": null,
      "file_cost": null,
      "braintrust_priced_spans": 0,
      "file_priced_spans": 0,
      "unpriced_token_spans": 1749,
      "no_usage_spans": 11,
      "coverage": "unknown"
    }
  ],
  "totals": {
    "candidate_spans": 6249,
    "cost": 141.76208183,
    "braintrust_cost": 141.76208183,
    "file_cost": null,
    "braintrust_priced_spans": 4193,
    "file_priced_spans": 0,
    "unpriced_token_spans": 1753,
    "no_usage_spans": 303,
    "coverage": "partial"
  }
}

[github-actions]

Latest downloadable build artifacts for this PR commit 0c407076eb84:

• Workflow run: https://github.com/braintrustdata/bt/actions/runs/29793424548
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