{
  "note": "Append-only price and benchmark history for benchr models. Each entry is a snapshot of one model at a point in time. Do NOT backfill historical data — only add verified entries from the day you verify them. Format: add a new object to the 'snapshots' array. Never edit or delete existing entries.",
  "append_format": {
    "fields": {
      "date": "YYYY-MM-DD (required)",
      "model_id": "matches models.json id field (required)",
      "model_name": "human-readable model name (required)",
      "event": "one of: price_change | new_model | benchmark_update | deprecation_announced | sunset | context_change",
      "pricing": "{ input_per_million, output_per_million } — omit if unchanged",
      "context_max_tokens": "new context window size — omit if unchanged",
      "benchmarks": "{ key: value } — omit if unchanged",
      "note": "one-line description of what changed and the official source"
    },
    "example": {
      "date": "2026-07-01",
      "model_id": "gpt-5-5",
      "model_name": "GPT-5.5",
      "event": "price_change",
      "pricing": { "input_per_million": 4.00, "output_per_million": 25.00 },
      "note": "OpenAI reduced GPT-5.5 pricing. Source: openai.com/pricing"
    }
  },
  "snapshots": [
    {
      "date": "2026-06-01",
      "model_id": "claude-opus-4-8",
      "model_name": "Claude Opus 4.8",
      "event": "new_model",
      "pricing": { "input_per_million": 5.00, "output_per_million": 25.00 },
      "context_max_tokens": 200000,
      "note": "Claude Opus 4.8 launched May 28, 2026. $5/$25 standard; $10/$50 fast mode. SWE-Bench Pro 69.2%. Source: anthropic.com/news"
    },
    {
      "date": "2026-06-01",
      "model_id": "gpt-5-5",
      "model_name": "GPT-5.5",
      "event": "new_model",
      "pricing": { "input_per_million": 5.00, "output_per_million": 30.00 },
      "context_max_tokens": 1048576,
      "note": "GPT-5.5 launched April 24, 2026. $5/$30 standard; $2.50/$15 batch. Source: openai.com/pricing"
    },
    {
      "date": "2026-06-01",
      "model_id": "gpt-5",
      "model_name": "GPT-5",
      "event": "new_model",
      "pricing": { "input_per_million": 1.25, "output_per_million": 10.00 },
      "context_max_tokens": 400000,
      "note": "GPT-5 launched August 7, 2025. $1.25/$10. Source: openai.com/pricing"
    },
    {
      "date": "2026-06-01",
      "model_id": "gpt-5-mini",
      "model_name": "GPT-5 Mini",
      "event": "new_model",
      "pricing": { "input_per_million": 0.25, "output_per_million": 2.00 },
      "note": "GPT-5 Mini — $0.25/$2.00. Cached input $0.025. Source: openai.com/pricing"
    },
    {
      "date": "2026-06-01",
      "model_id": "gemini-3-5-flash",
      "model_name": "Gemini 3.5 Flash",
      "event": "new_model",
      "pricing": { "input_per_million": 1.50, "output_per_million": 9.00 },
      "context_max_tokens": 1048576,
      "note": "Gemini 3.5 Flash GA since May 19, 2026 (Google I/O). $1.50/$9.00. Source: ai.google.dev/pricing"
    },
    {
      "date": "2026-06-01",
      "model_id": "grok-4-3",
      "model_name": "Grok 4.3",
      "event": "new_model",
      "pricing": { "input_per_million": 1.25, "output_per_million": 2.50 },
      "context_max_tokens": 1000000,
      "note": "Grok 4.3 — $1.25/$2.50; cached $0.20. Source: x.ai/api"
    },
    {
      "date": "2026-06-01",
      "model_id": "deepseek-v4-pro",
      "model_name": "DeepSeek V4-Pro",
      "event": "new_model",
      "pricing": { "input_per_million": 0.435, "output_per_million": 0.87 },
      "context_max_tokens": 1000000,
      "note": "DeepSeek V4-Pro launched April 24, 2026. MIT license. Source: api-docs.deepseek.com/quick_start/pricing"
    },
    {
      "date": "2026-06-01",
      "model_id": "deepseek-v4-flash",
      "model_name": "DeepSeek V4-Flash",
      "event": "new_model",
      "pricing": { "input_per_million": 0.14, "output_per_million": 0.28 },
      "context_max_tokens": 1000000,
      "note": "DeepSeek V4-Flash launched April 24, 2026. MIT license. Cheapest commercial API in this set. Source: api-docs.deepseek.com"
    },
    {
      "date": "2026-06-01",
      "model_id": "kimi-k2-6",
      "model_name": "Kimi K2.6",
      "event": "new_model",
      "pricing": { "input_per_million": 0.95, "output_per_million": 4.00 },
      "context_max_tokens": 262144,
      "note": "Kimi K2.6 released April 20, 2026. Modified MIT. Source: platform.moonshot.ai/docs/pricing"
    },
    {
      "date": "2026-06-01",
      "model_id": "mistral-large-3",
      "model_name": "Mistral Large 3",
      "event": "new_model",
      "pricing": { "input_per_million": 0.50, "output_per_million": 1.50 },
      "context_max_tokens": 256000,
      "note": "Mistral Large 3 released December 2, 2025. Apache 2.0. API id: mistral-large-2512. Source: mistral.ai/technology/models"
    },
    {
      "date": "2026-06-01",
      "model_id": "llama-4-maverick",
      "model_name": "Llama 4 Maverick",
      "event": "new_model",
      "pricing": null,
      "context_max_tokens": 1000000,
      "note": "Llama 4 Maverick released April 5, 2025. Community License. Self-hosted, no API fee. Source: ai.meta.com/llama"
    },
    {
      "date": "2026-06-01",
      "model_id": "llama-4-scout",
      "model_name": "Llama 4 Scout",
      "event": "new_model",
      "pricing": null,
      "context_max_tokens": 10000000,
      "note": "Llama 4 Scout released April 5, 2025. Community License. 10M token context. Self-hosted. Source: ai.meta.com/llama"
    }
  ]
}