Consensus answer
Whether Grok 4.5 is "better" than GPT-5.5 or Claude Opus 4.8 depends entirely on your specific needs, as no single model dominates across every category. While Grok 4.5 is highly competitive, it is not universally superior to the other two.
According to the Artificial Analysis Intelligence Index, Claude Opus 4.8 holds a slight edge with a score of 56, followed closely by GPT-5.5 at 55, and Grok 4.5 at 54 artificialanalysis.
Benchmark Performance
Head-to-head evaluations show a mixed picture depending on the task:
- SWE-Bench Pro (Coding): Claude Opus 4.8 leads the pack at 69.2%, followed by Grok 4.5 at 64.7%, and GPT-5.5 at 58.6% x x.
- Terminal Bench 2.1 (System/CLI tasks): GPT-5.5 (83.4%) and Grok 4.5 (83.3%) are virtually tied, with Opus 4.8 slightly behind at 78.9% x the-decoder.
- DeepSWE 1.1 (Developer tasks): GPT-5.5 holds a notable lead at 67%, outperforming Opus 4.8 at 59% and Grok 4.5 at 53% the-decoder x.
- DeepSWE 1.0: GPT-5.5 slightly leads Grok 4.5 (64.31% vs. 62.0%) x.
- Professional Judgment (GDPval): On specialized expert-level benchmarks, early evaluations show Grok 4.5 leading with a 29% pass rate, compared to 22% for GPT-5.5 and 21% for Opus 4.8 reddit.
Cost and Efficiency
Grok 4.5's primary advantage lies in its economic and operational efficiency:
- Pricing: Grok 4.5 is priced at $2 per million input tokens and $6 per million output tokens, making it significantly more affordable than Claude Opus 4.8 ($5 input / $25 output) and GPT-5.5 the-decoder.
- Token Efficiency: Grok 4.5 is highly optimized, requiring approximately 4.2 times fewer tokens than Opus 4.8 to resolve tasks on SWE-Bench Pro beehiiv the-decoder. This efficiency results in faster generation speeds and compounding cost savings.
Summary of Use Cases
- For maximum raw reasoning and coding performance: GPT-5.5 remains a top-tier choice, particularly for complex software development tasks where it leads on benchmarks like DeepSWE 1.1 the-decoder x.
- For complex agentic workflows and reliability: Claude Opus 4.8 is highly regarded and maintains the highest score on SWE-Bench Pro x x.
- For the best price-to-performance ratio: Grok 4.5 is a highly attractive option, offering near-frontier ("Opus-class") capabilities at a fraction of the cost, with superior speed and token efficiency beehiiv the-decoder.
Differences
1 notable difference (1 contradiction) across 6 models.
The existence and availability of the models.
The models are real and have benchmark data.
Gemini, Grok, Anthropic, OpenAI, Mistral
The models are hypothetical and do not exist.
DeepSeek
“Grok 4.5, GPT 5.5, and Opus 4.8 aren’t real models (at least not yet!)”
How to verify: Check if these models were released on July 8, 2026.
Best answerMistral
Sources
- 1 mashable.com vertexaisearch.cloud.google.com
- 2 wtvbam.com vertexaisearch.cloud.google.com
- 3 gizmodo.com vertexaisearch.cloud.google.com
- 4 reddit.com vertexaisearch.cloud.google.com
- 5 x.ai vertexaisearch.cloud.google.com
- 6 youtube.com vertexaisearch.cloud.google.com
- 7 youtube.com vertexaisearch.cloud.google.com
- 8 cybernews.com vertexaisearch.cloud.google.com
- 9 multiple.chat vertexaisearch.cloud.google.com
- 10 ycombinator.com vertexaisearch.cloud.google.com
- 11 the-decoder.com vertexaisearch.cloud.google.com
- 12 reddit.com vertexaisearch.cloud.google.com
- 13 Introducing Grok 4.5 | SpaceXAI x.ai
- 14 Introducing GPT-5.5 | OpenAI openai.com
- 15 Claude Opus 4.8 System Card www-cdn.anthropic.com
- 16 Grok 4 vs GPT-4.5 (Preview): Model Comparison artificialanalysis.ai
- 17 Grok 4.5 Launched Today: What xAI's Own Benchmarks Actually Show vs Opus 4.8 roo.beehiiv.com
- 18 Grok 4.5 is so cheap compared to Fable 5 and GPT 5.5 that benchmark gaps may not matter much the-decoder.com
- 19 SPACEXAI 🔥: Grok 4.5 performs on par with GPT 5.5 and close to Opus 4.8 on coding benchmarks. > Grok 4.5 can handle difficult, long-running tasks that require creatively using tools to solve problems, whether in software engineering, data science, finance, legal work, or anything else you do on a co threads.com
- 20 Introducing Grok 4.5 | SpaceXAI x.ai
- 21 Scoop: SpaceXAI launches new model, Grok 4.5 axios.com
- 22 vals.ai
- 23 reddit.com
- 24 artificialanalysis.ai
Cite this answer
consens.io. (2026-07-08). Consensus answer to "Is Grok 4.5 better than GPT 5.5 or Opus 4.8?". Models consulted: OpenAI: GPT-5.4 mini, Mistral: Mistral Medium 3.5, Anthropic Claude: Claude Haiku 4.5, Google Gemini: Gemini 3.1 Flash-Lite, DeepSeek: DeepSeek V4 Pro, Grok: Grok 4.20. Consensus model: gemini-3.5-flash. Sources: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFwjV_2CloJYVuwfFvJc2s4VvrDHEm91zOXx-V2uOia_pSsgcp0k_2x83yjq5zaXKr0Frit2_cNbaKTlZcLVJTMesOgDzhNF9QuBDfyXJxmmadhEe8sbD_I0GrEQIFgs1rBm0PT, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFbmf6hMZ25QgETrkld2Ce2UWr85jUV6-eK-tuLCIMW3v8E_3P-N9ZBNi9zzfQuWCWSxa0ZF428AxhTlLyuq-bDlepUG94LEACBBMLjaix1TU2XH4oYd_ABs3zeR5RmSQnValS4wZfx61egBAxzPzqxJdxnPSOx1U9TS4XsYtDVIOorVW7lMMIATK5nzkX4, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH52JDT2HVRWkOoohAhKM_5byNFG-Yno1p48SugCzNcXO8TvWeSORxopjCaZGZpBckC42EqHy0ew25T5fYqwflzrIb3wPE3O5uPNKLI3MX6ZDEg-2i1VSz9HANhhoRJyKj_13k1rogVRSvCJevuCywrGUWYjTjuzpmDpF2tG_aMfv9wuOQMCf0CXXDn4-olEwnflB7iZmCJcbcua-hksRyscQ3T5r4kwjNpDd1ZMwF4IA==, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHYeAtdo4KFU4Pm8r2iZGNRf-n6Vk-wGBPpeRzP8HzVpq9pYxVVpY0ltKpLXg-blSbGSGqmXOxzvaYZVatGwB8hXHqU7VOCjMYGS_T0DQRN08UuDoO5Sd-6OG7HM6SJ9dWhp4g-KO819OlWraTphU5QPLlcES4WKd98PBRbtBCb2dUxOSJzACs=, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFqnhq46b417Vo_Up6lU6A9eFbekW2EIWjLjsQW2PKtg0kNg00pX6DXQOsZopppLS84ebiHKl-mtVqORi6iCeJsntVc_W1tA0Mfha7pjxIuWw==, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH8RG4Pqzf9wVVZyofCll_zyFU1dxdy8Et7vUq6KaEdKAUpU_Fxw_t8cVU2qK49L-YtwCmTllVcvvZWJGpKhDEs_WKV8wnHx11nzK0Kzs76jvqf9en2DHGGaMZ0k5uAd7oF, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHtHrKR467L5EmL8FmNQja0zoWl8xB5yVlxPt_vyOY6ixEWzqMw45IYEPEV5EdwaFQOHIkcQ2Qq_NgPJHkhls8JOEbvnbLN1GQi7GFEKfboWzvxEe5KfFHHtt1faD0ldgCj, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFTUnjfdfF5-VNCuxPMY7Zn1A9_CNFoyzLCs5A_HOQ3HCDKD2ONISa8FXSN4XlU0i6sjmSXyIUe9YIPEtrMyjosvxnW8CuF_3IH5SM0PAI5B0oASldPI6_aZBKkJxejCQfG-nBi5l1lWE-7, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGvHWatEDmGMWnovU6itXqydhXRpQBCj2807JUHz9UN2CsmyVWLLmiWB_P5Q4i7FopTfQOXlwLV7KGHJS7u8Eni0WdAnEt9EDOotXRndphJnpMqoH2FvWcgdDo=, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQESvfULOFZbSeUf25I2VmqNFa2_fQQYC2bPcjEvxk-asDobUUBKU62n85YYOd_tWIAgY0-WGsYa1tyIx4Yl-mTVj5AQirSYO-LEwgynlvDZHmoyTd7BSX3f6nHRnsjfytCFXhA=, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQF92p7J9l-kPqRduXv5MlRAawtyku-QnBxagMWvfrgvhOUVZ-PTj0YpMDmFbcdKxsMMP_60g6vH5L5QBJhp3hBrNK4jFN3H32EjNq4HcWV3Gzdmc-FKJmM8GWI1V2PiD20Mj0UCer80e2jnJzYGAb7WBnqlKWVs6Dyyj1ffQN8RdHUrpLSqeEEDSKoYT3lcJz6dnSfM1B91Nqmlm4r8l3qkRwJiVRDeq6-BECw=, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQEYF65XN4HwRz8dR3j6kVOSe3uMvCDgDnqIyyC8xrmncISY9WROVmNKnbUrrKuDNecU18hf2LxmpM_t4RlxJRvk5AFriJqvfX6Ik0V87ZI_goqtJpEgMaaZUr4vY9ef5KtgcnSObtlYG2x-tAzpLv0IRZWGgLwFnIo4PZSj, https://x.ai/news/grok-4-5?utm_source=openai, https://openai.com/index/introducing-gpt-5-5/?utm_source=openai, https://www-cdn.anthropic.com/0b4915911bb0d19eca5b5ee635c80fef830a37ea.pdf?utm_source=openai, https://artificialanalysis.ai/models/comparisons/grok-4-vs-gpt-4-5, https://roo.beehiiv.com/p/grok-4-5, https://the-decoder.com/grok-4-5-is-so-cheap-compared-to-fable-5-and-gpt-5-5-that-benchmark-gaps-may-not-matter-much/, https://www.threads.com/@testingcatalog/post/Dain8XZjfUp/spacexai-grok-performs-on-par-with-gpt-and-close-to-opus-on-coding-benchmarks, https://x.ai/news/grok-4-5, https://www.axios.com/2026/07/08/spacexai-grok-new-model, https://vals.ai/benchmarks/swebench, https://www.reddit.com/r/grok/comments/1ur1cp5/grok_45_passes_29_of_expert_criteria_on/, https://artificialanalysis.ai/models/comparisons/claude-opus-4-5-thinking-vs-grok-4 Retrieved from https://www.consens.io/s/is-grok-4-5-better-than-gpt-5-5-or-opus-4-8-mkOQclzzwarRIB9K
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