# gpt-image-2 Probe — Follow-up

_Driver model:_ `gpt-5`  
_Generated:_ 2026-04-26 12:16:08

## Summary

| Scenario | Result | Elapsed (s) | Notes |
| --- | --- | --- | --- |
| output_format_png | ✅ ok | 26.29 | size=1024x1024, quality=medium, output_format=png, background=opaque, b64_len=1556332 |
| output_format_jpeg | ✅ ok | 38.35 | size=1024x1024, quality=medium, output_format=jpeg, background=opaque, b64_len=66348 |
| output_format_webp | ✅ ok | 53.53 | size=1024x1024, quality=high, output_format=webp, background=opaque, b64_len=518328 |
| compression_50_alone | ❌ fail | 0.13 | `BadRequestError`: Error code: 400 - {'error': {'message': "Unknown parameter: 'tools[0].compressio |
| output_format_jpeg_compression_50 | ❌ fail | 0.08 | `BadRequestError`: Error code: 400 - {'error': {'message': "Unknown parameter: 'tools[0].compressio |
| output_format_webp_compression_75 | ❌ fail | 0.09 | `BadRequestError`: Error code: 400 - {'error': {'message': "Unknown parameter: 'tools[0].compressio |
| transparent_with_output_format_png | ✅ ok | 45.46 | size=1024x1024, quality=medium, output_format=png, background=transparent, b64_len=1781304 |
| combo_1024x1024_medium_png | ✅ ok | 32.75 | size=1024x1024, quality=medium, output_format=png, background=opaque, b64_len=1558840 |
| seed_no_format | ✅ ok | 25.14 | size=1024x1024, quality=low, output_format=png, background=opaque, b64_len=1467840 |
| edit_input_image_only | ❌ fail | 1.45 | `BadRequestError`: Error code: 400 - {'error': {'message': "Unknown parameter: 'tools[0].input_imag |
| edit_action_edit | ❌ fail | 1.48 | `BadRequestError`: Error code: 400 - {'error': {'message': "Unknown parameter: 'tools[0].input_imag |
| previous_response_chain | ✅ ok | 25.04 | size=1024x1024, quality=medium, output_format=png, background=opaque, b64_len=1631976 |

## Full results

### output_format_png

```json
{
  "label": "output_format_png",
  "ok": true,
  "elapsed_s": 26.29,
  "tool_options": {
    "output_format": "png"
  },
  "summary": {
    "id": "resp_059721395cd4c5510069ee475f26c88195b7df69a9736001c4",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "medium",
        "output_format": "png",
        "background": "opaque",
        "result_b64_len": 1556332
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 1227,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 793,
      "output_tokens_details": {
        "reasoning_tokens": 704
      },
      "total_tokens": 2020
    }
  }
}
```

### output_format_jpeg

```json
{
  "label": "output_format_jpeg",
  "ok": true,
  "elapsed_s": 38.35,
  "tool_options": {
    "output_format": "jpeg"
  },
  "summary": {
    "id": "resp_00b5c8ccad6921430069ee47792e54819580c4edb1b499dc10",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "medium",
        "output_format": "jpeg",
        "background": "opaque",
        "result_b64_len": 66348
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 2222,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 1788,
      "output_tokens_details": {
        "reasoning_tokens": 1664
      },
      "total_tokens": 4010
    }
  }
}
```

### output_format_webp

```json
{
  "label": "output_format_webp",
  "ok": true,
  "elapsed_s": 53.53,
  "tool_options": {
    "output_format": "webp"
  },
  "summary": {
    "id": "resp_02ce3fa77cb9dc170069ee479f82f0819688559e2493b78baa",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "high",
        "output_format": "webp",
        "background": "opaque",
        "result_b64_len": 518328
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 2228,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 1794,
      "output_tokens_details": {
        "reasoning_tokens": 1664
      },
      "total_tokens": 4022
    }
  }
}
```

### compression_50_alone

```json
{
  "label": "compression_50_alone",
  "ok": false,
  "elapsed_s": 0.13,
  "tool_options": {
    "compression": 50
  },
  "error_type": "BadRequestError",
  "error": "Error code: 400 - {'error': {'message': \"Unknown parameter: 'tools[0].compression'.\", 'type': 'invalid_request_error', 'param': 'tools[0].compression', 'code': 'unknown_parameter'}}"
}
```

### output_format_jpeg_compression_50

```json
{
  "label": "output_format_jpeg_compression_50",
  "ok": false,
  "elapsed_s": 0.08,
  "tool_options": {
    "output_format": "jpeg",
    "compression": 50
  },
  "error_type": "BadRequestError",
  "error": "Error code: 400 - {'error': {'message': \"Unknown parameter: 'tools[0].compression'.\", 'type': 'invalid_request_error', 'param': 'tools[0].compression', 'code': 'unknown_parameter'}}"
}
```

### output_format_webp_compression_75

```json
{
  "label": "output_format_webp_compression_75",
  "ok": false,
  "elapsed_s": 0.09,
  "tool_options": {
    "output_format": "webp",
    "compression": 75
  },
  "error_type": "BadRequestError",
  "error": "Error code: 400 - {'error': {'message': \"Unknown parameter: 'tools[0].compression'.\", 'type': 'invalid_request_error', 'param': 'tools[0].compression', 'code': 'unknown_parameter'}}"
}
```

### transparent_with_output_format_png

```json
{
  "label": "transparent_with_output_format_png",
  "ok": true,
  "elapsed_s": 45.46,
  "tool_options": {
    "output_format": "png",
    "background": "transparent"
  },
  "summary": {
    "id": "resp_0ae9c465cea1856a0069ee47d559d881909d63b79d432e1a53",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "medium",
        "output_format": "png",
        "background": "transparent",
        "result_b64_len": 1781304
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 1755,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 1321,
      "output_tokens_details": {
        "reasoning_tokens": 1216
      },
      "total_tokens": 3076
    }
  }
}
```

### combo_1024x1024_medium_png

```json
{
  "label": "combo_1024x1024_medium_png",
  "ok": true,
  "elapsed_s": 32.75,
  "tool_options": {
    "size": "1024x1024",
    "quality": "medium",
    "output_format": "png",
    "background": "auto"
  },
  "summary": {
    "id": "resp_02c97b7032feb25e0069ee4802cbb88190b8140f8b1f5c9cc1",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "medium",
        "output_format": "png",
        "background": "opaque",
        "result_b64_len": 1558840
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 1883,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 1449,
      "output_tokens_details": {
        "reasoning_tokens": 1344
      },
      "total_tokens": 3332
    }
  }
}
```

### seed_no_format

```json
{
  "label": "seed_no_format",
  "ok": true,
  "elapsed_s": 25.14,
  "summary": {
    "id": "resp_00c37d17fecd059f0069ee482395f88197ab88e98b100ba019",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "low",
        "output_format": "png",
        "background": "opaque",
        "result_b64_len": 1467840
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 1684,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 1251,
      "output_tokens_details": {
        "reasoning_tokens": 1152
      },
      "total_tokens": 2935
    }
  }
}
```

### edit_input_image_only

```json
{
  "label": "edit_input_image_only",
  "ok": false,
  "elapsed_s": 1.45,
  "error_type": "BadRequestError",
  "error": "Error code: 400 - {'error': {'message': \"Unknown parameter: 'tools[0].input_image'.\", 'type': 'invalid_request_error', 'param': 'tools[0].input_image', 'code': 'unknown_parameter'}}"
}
```

### edit_action_edit

```json
{
  "label": "edit_action_edit",
  "ok": false,
  "elapsed_s": 1.48,
  "error_type": "BadRequestError",
  "error": "Error code: 400 - {'error': {'message': \"Unknown parameter: 'tools[0].input_image'.\", 'type': 'invalid_request_error', 'param': 'tools[0].input_image', 'code': 'unknown_parameter'}}"
}
```

### previous_response_chain

```json
{
  "label": "previous_response_chain",
  "ok": true,
  "elapsed_s": 25.04,
  "summary": {
    "id": "resp_00c37d17fecd059f0069ee483fa19c8197aeb5e59c40759cbb",
    "status": "completed",
    "output_items": [
      {
        "type": "reasoning"
      },
      {
        "type": "image_generation_call",
        "size": "1024x1024",
        "quality": "medium",
        "output_format": "png",
        "background": "opaque",
        "result_b64_len": 1631976
      },
      {
        "type": "message"
      }
    ],
    "usage": {
      "input_tokens": 1126,
      "input_tokens_details": {
        "cached_tokens": 0
      },
      "output_tokens": 584,
      "output_tokens_details": {
        "reasoning_tokens": 448
      },
      "total_tokens": 1710
    }
  }
}
```