PR #26865: fix(cost): add gpt-image-2 pricing and routing

• Repository: BerriAI/litellm
• Author: xr843
• State: open | merged: False
• Link: https://github.com/BerriAI/litellm/pull/26865

Description (problem / solution / changelog)

Summary

Closes #26863. gpt-image-2 cost was always 0 because it was both missing from the cost map and misrouted to the per-image (DALL-E) calculator instead of the token-based calculator.

Changes

• Cost map (model_prices_and_context_window.json + litellm/model_prices_and_context_window_backup.json): add gpt-image-2, gpt-image-2-2026-04-21, azure/gpt-image-2, azure/gpt-image-2-2026-04-21 with token pricing per OpenAI docs:
  • text input: $5/1M, cached $1.25/1M
  • image input: $8/1M, cached $2/1M
  • image output: $30/1M
• Routing (litellm/litellm_core_utils/llm_cost_calc/utils.py): replace the "gpt-image-1" in model_lower substring check with model_lower.startswith("gpt-image-") or "/gpt-image-" in model_lower. The old substring incidentally matched gpt-image-1.5, but never gpt-image-2. New matcher covers all current and future gpt-image-* variants and Azure-prefixed forms.
• Tests (tests/test_litellm/test_gpt_image_cost_calculator.py): add TestGPTImage2Cost with two cases — direct completion_cost for gpt-image-2, and azure/gpt-image-2 routing through CostCalculatorUtils. Both use LITELLM_LOCAL_MODEL_COST_MAP=True so they don't depend on the remote cost map.

Test plan

• pytest tests/test_litellm/test_gpt_image_cost_calculator.py -v → 10/10 pass
• Verified gpt-image-1 and gpt-image-1.5 still route correctly (existing tests unchanged)
• Verified DALL-E still routes to per-image calculator (existing test unchanged)

Notes

• output_cost_per_token (text output) is intentionally omitted — OpenAI's gpt-image-2 pricing section lists token costs but does not include a separate text output rate (unlike gpt-image-1.5 which lists $10/1M).
• Per-image quality/size variants (high/1024-x-1024/gpt-image-2 etc.) are not added because OpenAI's gpt-image-2 pricing page only lists token-based pricing.

Changed files

• litellm/litellm_core_utils/llm_cost_calc/utils.py (modified, +2/-2)
• litellm/model_prices_and_context_window_backup.json (modified, +58/-0)
• model_prices_and_context_window.json (modified, +58/-0)
• tests/test_litellm/test_gpt_image_cost_calculator.py (modified, +88/-0)

PR #26866: feat(pricing): add gpt-image-2 and azure_ai/gpt-image-2 model pricing

• Repository: BerriAI/litellm
• Author: xodn348
• State: open | merged: False
• Link: https://github.com/BerriAI/litellm/pull/26866

Description (problem / solution / changelog)

Summary

Adds pricing entries for OpenAI's gpt-image-2 model and its Azure AI Foundry (azure_ai/gpt-image-2) variant to both model_prices_and_context_window.json and litellm/model_prices_and_context_window_backup.json.

Pricing values sourced from https://platform.openai.com/docs/models/gpt-image-2 and https://azure.microsoft.com/en-us/pricing/details/cognitive-services/openai-service/:

Both openai and azure_ai providers support /v1/images/generations and /v1/images/edits endpoints.

Closes #26765 Relates to #26863 (gpt-image-2 cost always 0 — this adds the missing cost entry)

Test plan

• Both JSON files parse as valid JSON (python3 -c "import json; json.load(open(...))")
• Pricing values match the official OpenAI API pricing page for gpt-image-2
• Entry format mirrors existing gpt-image-1 / azure/gpt-image-1 structure

Changed files

• litellm/model_prices_and_context_window_backup.json (modified, +28/-0)
• model_prices_and_context_window.json (modified, +28/-0)